Republican candidates disagree on a wide range of topics: STD vaccines to Social Security

Candidates play fast and loose with facts about each other, history

Western debate between Republican presidential nominees grows feisty

FactCheck.org lays out the busy weekend for Republican presidential candidates leading up to N.H. primary

New ad and web video from Gingrich make misleading claims about the GOP front-runner

Ad brings up a donation Romney gave to the Democratic party in 1992.

Gingrich’s plan would mean nearly zero tax for Romney

The Gingrich side has finally begun to fight back with TV attack ads of its own in Florida

Santorum campaign ad attacking Mitt Romney makes false claims, again

Pro-Obama super PAC ad leaves out important truths in ad condemning Romney's past business dealings.