WASHINGTON (Reuters) - President Barack Obama expanded his lead over Republican challenger Mitt Romney to 6 percentage points...

WASHINGTON (Reuters) - Most Americans oppose President Barack Obama's healthcare reform even though they strongly support...

WASHINGTON (Reuters) - President Barack Obama's lead over Mitt Romney has narrowed to 4 percentage points from 11 points ...

WASHINGTON (Reuters) - White House hopeful Mitt Romney's lead over rival Newt Gingrich has stretched to 15 percentage poi...

WASHINGTON (Reuters) - Republican presidential candidate Mitt Romney has opened a wide lead over his rivals in the South Caro...

WASHINGTON (Reuters) - Mitt Romney leads the field vying for the Republican presidential nomination, but fewer than one in fo...