Latest national election headlines

• Romney: Obama doesn't get free enterprise system
• Obama to campaign in Iowa, promote energy plan
• Romney campaign outlines 'day 1' of his presidency
• Obama's 2008 magic past, Iowa all-out battleground
• Search for Romney running mate in audition phase
• AdWatch: Romney "day one" vows oversimplify
• GOP's Rubio plans to sell books in swing states
• FACT CHECK: Romney off on Obama's love for unions
• Romney running mate search enters audition phase
• Romney faces tough questions from black leaders
• THE RACE: Romney talks up his private-sector days
• Obama, Dems redoubling money efforts to keep edge
• Obama team wrongly says Romney moves goal posts
• Obama birth certificate OK by Arizona official
• Obama team trumpets new polling on gay marriage
• Romney promotes education agenda, defends Bain
• Obama team wrongly says Romney moves goal posts
• Obama airing ads on veterans, seniors
• THE RACE: Obama walking fine line in Bain critique
• Obama focuses on seniors, veterans in positive ads
• Romney oil adviser also a big super PAC donor
• Primary sweep has Romney 1 win from GOP nomination
• Romney defends record at Bain Capital firm
• Romney says Congress should wait to act on economy
• Primary protest votes show displeasure with Obama
• Romney inches closer to GOP nomination with sweep
• Biden dismisses Romney's experience in business
• 'A woman who. ...': Romney's stories court females
• Ad aimed at women takes on Obama's economic record
• THE RACE: Polls show presidential race tightening
• Powell not ready to endorse Obama for re-election
• Independent groups launch dueling campaign ads
• Obama to push clean energy technologies in Iowa
• Romney's playbook on Bain unclear as attacks grow
• Obama stands by hits on Romney's Bain Capital days
• Conservative donors slow to back Romney's campaign
• New Obama ad challenges Mitt Romney's economics
• Obama stands by hits on Romney's Bain Capital days
• Cory Booker is latest gaffe-prone Obama surrogate
• Booker is latest gaffe-prone campaign surrogate
• Mandel, Renacci donations subject of federal probe
• Where Romney, Sen. Brown stand on various issues
• Romney, US Sen. Brown play down past connections
• Romney to raise about $10 million in NY, Conn.
• Romney to raise about $10 million in NY, Conn.
• Newark mayor: Romney business record is fair game
• Conservative donors slow to back Romney's campaign
• Obama holds 2-to-1 cash advantage over Romney
• Political vulnerabilities in Sen. Rubio's past?
• Gay marriage could be big voting issue in Colorado