CAESAR

SUNRISE, Fla. – Democratic presidential candidate Barack Obama plunked down $4 million for a campaign-closing television ad Wednesday night and summoned voters to "choose hope over fear and unity over division" in Tuesday's election. Republican John McCain derided the event as a "gauzy, feel-good commercial," paid for with broken promises.

"America, the time for change has come," Obama said in the final moments of the unusual ad, a blend of videotaped moments and a live appearance before thousands in Sunrise, Fla.

"In six days we can choose an economy that rewards work and creates jobs and fuels prosperity starting with the middle class," Obama said.

The 30-minute ad, aired on CBS, NBC, Fox and several cable networks, came days from the end of a race in which Obama holds the lead in polls nationally and in most key battleground states as he bids to become the first black president.

And while it is unusual for candidates to acknowledge the possibility of defeat, Republican running mate Sarah Palin said she intended to remain a national figure even if the ticket loses next week. "I'm not doin' this for naught," she told ABC News in an interview.

Republicans and even some Democrats said the race was tightening as it neared the end. Although Obama made no mention of McCain in his paid television ad, both men sharpened their rhetoric during the day.

McCain, in Florida, argued that Obama lacks "what it takes to protect America from terrorists" as he sought to shift attention away from the economy.

"The question is whether this is a man who has what it takes to protect America from Osama bin Laden, al-Qaida and the other great threats in the world," he said. "He has given no reason to answer in the affirmative."

Obama, in North Carolina, said if, "Sen. McCain is elected, 100 million Americans will not get a tax cut ... your health care benefits will get taxed for the first time in history ... we'll have another president who wants to privatize part of your Social Security."

For weeks now, the race has tilted Obama's way as the two men traverse traditionally Republican states — Obama angling for a sizable triumph and McCain hoping to win the White House in a close finish.

Associated Press-GfK polls taken within the past several days showed Obama ahead in four states that supported President Bush in 2004 and essentially even with McCain in two others. A separate survey suggested even McCain's home state of Arizona was not safely in his column.

The 30-minute campaign commercial, purchased at a cost that campaign aides put at roughly $4 million, not only marked Obama's attempt to seal his case with the electorate, but also underscored his enormous financial advantage in the race. He has outraised McCain by far after first committing — and then reneging — on a pledge to limit spending to the $84 million available under federal matching funds.

Obama used his commercial to pledge a rescue plan for the middle class in tough times. "I will not be a perfect president," he said. "But I can promise you this — I will always tell you what I think and where I stand."

Across 30 minutes, the ad blended views of Obama speaking in a setting that resembled the Oval Office, at the Democratic National Convention and elsewhere as well as scenes of Americans discussing their economic and health care troubles. His wife, Michelle, and his two daughters had cameos, and there were photos of his black father from Kenya and white mother from Kansas.

McCain sought to blunt Obama's campaign-closing pitch, lacking the funds to match it.

"He's got a few things he wants to sell you: He's offering government-run health care ... an energy plan guaranteed to work without drilling ... and an automatic wealth spreader that folds neatly and fits under any bed," McCain told an audience in Florida.

The Republican National committee on Wednesday unveiled a new ad that seeks to raise doubts about Obama's lack of executive experience. The ad will begin airing Thursday in Ohio, Indiana, Virginia and Florida markets.

"Would you go under with a surgeon who has never operated?" an announcer says. "Can you hand your nation to a man who has never been in charge of anything? Can you wait while he learns?"

Earlier in the campaign, former Democratic rival Sen. Hillary Rodham Clinton as well as McCain sought to raise doubts about Obama's relatively thin resume on foreign policy and national security matters.

In response, Obama traveled last summer to Iraq, Afghanistan and Europe, where he met with world leaders. Later, he tapped Sen. Joseph Biden, who has long experience in foreign policy, as his vice presidential running mate.

More recently, he won an endorsement from former Secretary of State Colin Powell.

Conversely, McCain has slumped in the polls as the economic crisis has unfolded in the past several weeks.

Speaking to reporters Wednesday, he said the economic meltdown, while serious, was temporary, and the nation would emerge stronger.

Besides Obama, he criticized the Democratic leaders of Congress, who hope to command larger majorities in the new House and Senate than they do now.

"We're getting only a glimpse of what one-party rule will look like," he said, predicting deep cuts in defense spending and efforts to shrink America's role in the world if Democrats take over the government.

"Let there be no confusion about the threats we face," said McCain. "I've had to make some defining choices along the way," he added in what seemed to be a reference to his time in the Navy, more than five years of which were spent as a prisoner of war in Vietnam.

Obama blended his sharp rhetoric with a more humorous approach as he sought to fend off McCain's charge that his tax policies amount to socialism.

McCain, he said, will soon "be accusing me of being a secret communist because I shared my toys in kindergarten."

RENO, Nev. – Scrambling to win the West, Democrat Barack Obama mocked John McCainPresident Bush. McCain touted his Western ties and warned that Obama is a tax-and-spend threat to the nation. on Saturday for aggressively trying to distance himself from

The financially flush Obama campaign also unveiled a two-minute TV ad that asks, "Will our country be better off four years from now?" The length of the ad, which will air in key states, highlights Obama's fundraising superiority — most campaign commercials run 30 seconds or a minute.

Obama continued to ridicule McCain for distancing himself from the president.

"John McCain attacking George Bush for his out-of-hand economic policy is like Dick Cheney attacking George Bush for his go-it-alone foreign policy," Obama said. Later in the day, Obama put McCain's criticism of Bush this way: "It's like Robin getting mad at Batman."

Ten days before the election, both candidates were targeting the same trio of states — Nevada, Colorado and New Mexico. Any of them could help shape who wins the presidency.

The flurry of appearances by Obama and McCain likely represent the last time in a long, testy campaign that the toss-up territory of the West will get this much attention. Electoral prizes like Ohio, Pennsylvania and Florida, will soon take the spotlight.

Obama said it was too late for McCain to portray himself as independent from Bush after standing with him for years. McCain has a mixed record of supporting and bucking Bush.

Real change, Obama said, is "not somebody who's trying to break with his president over the last 10 days after having supporting him for the last eight years."

As the front-running Obama campaigned at a baseball stadium, McCain was at an outdoor rally at the New Mexico state fairgrounds in Albuquerque. The Arizona Republican claimed he had the edge in battleground states in the region, calling himself "a fellow Westerner."

"Sen. Obama has never been south of the border," said McCain, arguing that he has a feel for issues like water that resonate throughout the region. Obama's campaign said Obama has, in fact, been to Mexico before he got into public office.

Later, in Mesilla, N.M., McCain said he had a home-court advantage in the West.

"I know the issues, I know land, I know water, I know native American issues," said McCain, speaking at a sun-splashed rally. "I know how western states are growing with dynamic strength. Senator Obama does not understand these issues."

McCain continued to portray Obama, an Illinois senator, as a tax-and-spend liberal certain to push for more government and higher spending.

"He believes in redistributing wealth," McCain said. "That's not America."

His running mate, Sarah Palin, evoked the same theme Saturday in Sioux City, Iowa.

While she spoke, the crowd at her rally cried out about Obama: "He's a socialist."

Obama, meanwhile, continued to use his massive fundraising appeal to his advantage.

The new Obama ad is scheduled to begin running Sunday. While not mentioning McCain, it promotes Obama's economic policies while saying the Democrat will work to end "mindless partisanship" and "divisiveness."

The Republican National Committee released its own TV ad Saturday questioning whether Obama has the experience to be president. The ad, featuring the image of a stormy ocean, says the nation is in "uncertain times" that could get worse and asks whether voters want a president "who's untested at the helm."

In competitive Virginia, Democratic vice presidential candidate Joe Biden said Americans have been "knocked down" by Bush's economic policies. "It's time for us to get back up," he said. "It's time for us together to get back up and demand the change we need."

The West, once reliable Republican territory, has seen its politics and demographics shift over the last decade. Bush narrowly won Nevada, Colorado and New Mexico four years ago and Democrats see those states and their 19 electoral votes as a real opportunity.

There was a glitch for Obama in Reno. A generator at his rally apparently failed, killing power and cutting off his microphone. Obama said someone from the McCain campaign may have pulled the plug on the rally. He quickly added he was kidding.

Later, at a rally at a high school football field in Las Vegas, Obama said: "We're not going to let George Bush pass the torch to John McCain."

And at a rowdy night rally in Albuquerque — the same city where McCain had spoken earlier — Obama told supporters not to let up. Democrat Al Gore won the state by just 366 votes in 2000.

"I know seeing this crowd here tonight, that we will not let up," Obama said to cheers.

Obama resumed his campaign in Nevada after spending Thursday night and Friday in Hawaii with his grandmother, who is gravely ill. He offered thanks to those who wished her well.

Despite sour polls, McCain pledged a scrappy close to the campaign.

"We're a few points down and the pundits, of course, as they have four or five times, have written us off," said McCain. "We've got them just where we want them."

McCain was headed briefly to El Paso, Texas, before moving on to Iowa where he's looking to make up for some lost ground in a state campaign aides argue is closer than the public polling shows. McCain was to appear on "Meet the Press" and hold a campaign rally.

Obama is campaigning on Sunday in Colorado.

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Associated Press writers Dena Potter, Mike Glover and Anna Jo Bratton contributed to this report.