Economic Fears Give Obama Clear Lead Over McCain in Poll

She remains broadly popular -- 52 percent of voters view her positively -- but there have been some notable declines. Over the past two weeks, the percentage of independents with favorable views of Palin dropped from 60 percent to 48 percent. Among independent women, the decline was particularly sharp, going from 65 percent to 43 percent. Her favorable rating among whites without college degrees remained largely steady, but among those with college degrees, it dropped nearly 20 percentage points.

The survey also showed some backsliding in enthusiasm among McCain supporters. Overall, most supporters of each presidential candidate said they are enthusiastic about their choice, but 62 percent of Obama supporters said they are "very enthusiastic," compared with 34 percent of McCain's supporters. Coming out of the GOP convention, nearly half of those backing McCain said they did so fervently.

Among Republicans, conservatives and white evangelical Protestants, strong enthusiasm for McCain's candidacy has dropped by double digits.

The survey, conducted Friday through Monday, included telephone interviews with a random national sample of 1,082 adults, including 916 registered voters. The margin of error for the full sample is plus or minus three percentage points; it is four points for the sample of 780 likely voters.

Overall, Obama and McCain are tied among men in the new poll, while Obama has opened up a sizable lead among women. The candidates divide white voters, 50 percent for McCain to 45 percent for Obama, while Obama has an overwhelming advantage among African Americans, 96 percent to 3 percent.

Independents, key swing voters, now break for Obama, 53 percent to 39 percent, reversing a small lead for McCain after the Republican convention. McCain is the choice of 86 percent of Republicans, while about as many Democrats, 88 percent, back Obama.

In the new poll, voters once again gave Obama higher marks than McCain when it comes to dealing with the economy, 53 percent to 39 percent. Two weeks ago, Obama's edge on the question was a narrow five points, his lowest of the campaign. Among independents, Obama's advantage on the economy -- now 21 points -- is greater than at any point in the campaign.

McCain's advantages on national security issues have also been blunted. Two weeks ago, when those surveyed were asked who they trusted to deal with a major unexpected crisis, McCain led 54 percent to 37 percent. That lead is gone.

Similarly, McCain's once-sizable advantage in dealing with the battle against terrorism has all but disappeared. There were also big shifts toward Obama on handling Iraq and international affairs more broadly.

The first presidential debate, set for Friday evening, is slated to focus on foreign policy and national security, but economic issues seem likely to be included, given the developments on Wall Street. The debate appears poised to draw record levels of attention, as interest in the election has been sky high and continues to grow. Almost all voters are tuned in, and 55 percent are following "very closely," higher than at this time in 2004 and more than double the percentage so engaged in 2000.

A substantial hurdle for Obama is the widespread public skepticism about whether he would make a good commander in chief. On that question, he has made no significant headway in allaying voters' concerns. They remain evenly divided -- 48 percent said he would be effective in that role, 47 percent said he would not. Nearly three-quarters said McCain would manage the military well, and as many said he has the knowledge of world affairs to serve effectively.

Still, the candidates are rated about equally on the question of who is the stronger leader.

In the aftermath of the national conventions and the surprise pick of Palin, McCain had narrowed the gap with Obama on who is more likely to change Washington. In the new survey, Obama has reestablished his credentials on that front. He also now holds a double-digit lead as the more honest and trustworthy candidate, flipping what had been a slight McCain edge two weeks ago.

Obama has also cemented a clear edge among voters prioritizing the economy, a growing group. Among "economy voters," he now leads McCain by nearly 2 to 1. McCain holds advantages among voters prioritizing a range of concerns that rank lower on the issues list, making it harder for him to find ways to drive the agenda of the campaign into favorable territory.

Polling analyst Jennifer Agiesta contributed to this report.