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

Perry campaign using statistics from a unverifiable conservative think tank, and using them often

FACT CHECK: Perry unfairly characterizes Romney on stimulus

Western debate between Republican presidential nominees grows feisty

Republican presidential front-runner referred to a number of U.S. policies as 'magnets' for illegal immigration

Contrary to Gov. Rick Perry's claim, Mass. 2006 health care law included no coverage for illegal immigrants

Former Mass. governor used unproven, misleading facts to hail his job creation prowess

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.