Poll: Obama, Romney neck and neck

For all the attention it got, Republican Mitt Romney's selection of Rep. Paul Ryan of Wisconsin as his running mate has not altered the race against President Barack Obama. The campaign remains neck and neck with less than three months to go, a new AP-GfK poll shows.

Overall, 47 percent of registered voters said they planned to back Obama and Vice President Joe Biden in November, while 46 percent favored Romney and Ryan. In a June AP-GfK survey, the split was 47 percent for the president to 44 percent for Romney.

At the same time, there's a far wider gap when people were asked who they thought would win. Some 58 percent of adults said they expected Obama to be re-elected; 32 percent thought he'd be voted out of office.

Republicans are less sure about Romney than Democrats are about Obama -- 83 percent of Democrats say Obama will be re-elected while 57 percent of Republicans think he'll lose.

The AP-GfK poll surveyed 1,006 adults nationwide, including 885 registered voters. The full sample has a margin of error of plus or minus 3.9 percentage points; it's 4.1 for registered voters.

Meanwhile, Obama holds a 4-percentage-point lead over Romney in a Wall Street Journal/NBC News poll, according to Bloomberg News.

The poll released Wednesday showed Obama with 48 percent backing of registered voters, Romney with 44 percent. Obama has never trailed in the survey, holding a 6-point lead last month, 49 percent to 43 percent, and advantages of between 1 and 6 percentage points in the last 12 months.

The survey found 47 percent of voters preferring a Democratic-controlled Congress, 42 percent favoring Republicans in charge.

Just 12 percent approved of the job Congress is doing; 82 percent disapproved. The last time Congress' approval rating was that low in the poll was in October 2008, a month before Obama won the presidency and Democrats added to their majorities in the House and Senate.The WSJ/NBC survey of 1,000 registered voters was taken Aug. 16-20 and has a margin of error of plus or minus 3.1 percentage points.