But earlier in the contest, the loudest voice promoting the former Pennsylvania senator wasn't the candidate himself. It was Foster Friess, a multimillionaire who was the main funder of a pro-Santorum superPAC.
Supporters listen to Republican presidential candidate Rick Santorum at The Ravine in Bellevue, Wis., on March 24. Some voters in the state are complaining about a barrage of negative ads in advance of Tuesday's primary.
With a GOP presidential primary coming up on April 3, Wisconsin voters have found themselves besieged by political ads, reports NPR's David Schaper on Friday's Morning Edition.
Talking to voters in La Crosse, Schaper found that residents have grown weary of the onslaught. It has been massive: The Red, White And Blue Fund — the superPAC supporting Rick Santorum — has so far spent almost a half-million dollars on ads attacking front-runner Mitt Romney.
Comedian Bill Maher's $1 million check to the superPAC supporting President Obama's re-election is the first seven-figure donation to the group since Obama tacitly endorsed the fundraising strategy in early February.
And it has brought new focus to some of Maher's statements about women — specifically Republican women — and led to calls for the White House to disavow the HBO host and his money.
The latest reports from the Federal Election Commission shed new light on the political largesse of two Texas businessmen who have become common names in the world of Republican fundraising.
With a $1 million check in February to the superPAC backing Rick Santorum, Dallas nuclear waste dump owner Harold Simmons and his wife, Annette, have now contributed to groups supporting all three of the top GOP candidates.