Mitt Romney's strong performance at the debate last week wiped out President Barack Obama's lead in the latest national poll conducted by the Pew Research Center, but not the Gallup Poll.
Mr. Romney's Pew lead was propelled in part by the growing support from women and younger and educated adults, while increasing his advantage with white voters.
Overall, Mr. Romney was backed by 49 percent of likely voters in the Pew poll, and Mr. Obama had support from 45 percent. The 4-point difference was within the poll's margin of sampling error of 3 percentage points for each candidate. Mr. Obama had an 8-point lead among likely voters in last month's Pew poll.
The latest Gallup Poll numbers, released Monday, show a deadlocked race. Both Mr. Obama and Mr. Romney were favored by 47 percent of registered voters. The Gallup survey was conducted Thursday through Saturday, and also had a margin of sampling error of 3 percentage points. In its analysis, Gallup cautioned that Friday's jobs numbers, which showed a drop in the unemployment rate to below 8 percent, could "blunt some of Romney's post-debate momentum."
Mr. Obama began the week with a three-point edge in Gallup's seven-day tracking poll (a less-volatile measure). Throughout the campaign, Gallup's numbers have shown the race closer than some other national polls.
In the latest Pew poll, women were split, 47 percent for each candidate. Men preferred Mr. Romney, 51 percent to 43 percent. Last month, Mr. Obama had an 18-point advantage among women, and men were almost evenly divided. Similarly, voters under 50 were closely divided between the candidates: In September, Mr. Obama had a 17-point edge with those voters.
While there was no change in Mr. Obama's support from black voters (he was still backed by more than 90 percent), Mr. Romney increased his advantage among white voters by 7 points.
Pew's phone polls were conducted Sept. 12-16 with 2,192 likely voters and Thursday through Sunday with 1,112 likely voters.
Los Angeles Times contributed.