Mitch Daniels raised more than $2 million for his state-based PAC, highest among presidential contenders

Fundraisers for Mitt Romney hope to raise up to $3 million in a one-day money marathon

Super PAC ads illustrate the new playing field in campaign finance

Former Huntsman campaign official now raising money for group behind New Hampshire campaign ads

Perry down in the polls, but gets support from outside group

An outside spending group that supports Mitt Romney produces slick ad slamming Iowa poll leader Gingrich

Impact of 'super PACs' felt in Iowa as undisclosed funds fuel advertising blitz

Donation aside, supporter becomes rival in GOP presidential contest

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

Candidates fumble some claims hours before they'll face off again