Barack Obama is closely matched against four leading GOP candidates in prospective presidential election trial heats. Mitt Romney edges Obama by two percentage points among registered voters. Rick Perry and Obama are tied, but Obama has a slight ...

No third-party candidate gets more than 3% of the vote in the U.S. presidential race, as the vast majority of U.S. voters say they would vote for either Barack Obama or Mitt Romney if the election were held today.

The Republican presidential race is now a 32% to 30% statistical tie between Mitt Romney and Rick Santorum, in Gallup interviewing conducted wholly after Santorum's victories in the Feb. 7 nominating contests.

As he turns to the general election campaign, Mitt Romney faces the challenge of generating enthusiasm and, hence, turnout among Midwestern, young, highly religious, and conservative Republicans -- groups among whom he has struggled.

Mitt Romney leads Rick Santorum slightly, 34% to 30%, in national Republicans' preferences for their party's nomination. Romney is ahead among most subgroups; Santorum does best among conservatives and in the Midwest.

Newt Gingrich has all but erased Mitt Romney's 23-percentage-point lead of a week ago among Republican voters nationally, and the two candidates are now essentially tied, at 29% for Romney and 28% for Gingrich.

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Mitt Romney is now the only candidate that a majority of conservative and moderate/liberal Republicans nationwide see as an acceptable GOP nominee for president. Conservative Republicans are more likely to say this about Romney than about either ...

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Attorney and former Pennsylvania Sen. Rick Santorum is now suffering the fate of former college professor and Congressman Newt Gingrich -- rising to front-runner status among Republicans nationwide and then falling right back down again.