First-Quarter Senate Fundraising Winners and Losers—PICTURES

Winner: Democratic contender Elizabeth Warren raised $6.9 million — by far the most by any Senate candidate — and narrowing the cash-on-hand gap in her race against Sen. Scott Brown, R-Mass. (Chet Susslin)

Winner: Republican Heather Wilson, who represented New Mexico's 1st District until 2009, raised $760,000, which allowed her to finish with $1.45 million in the bank. (AP Photo/Jake Schoellkopf)

Winner: Bob Kerrey reported raising $900,000 in the month since entering the race in Nebraska — more than the combined intake of the three main GOP candidates running during the full quarter. (AP Photo/Bill Wolf)

Winner: Sen. Sherrod Brown, D-Ohio, took in $2.4 million, outraising his opponent, GOP state Treasurer Josh Mandel, for the second quarter in a row. (AP Photo/J. Scott Applewhite)

Winner: In Indiana, Republican primary challenger Richard Mourdock finally turned the corner last quarter, outraising Sen. Richard Lugar and building a national coalition of conservative support. (TOM STRATTMAN/AP)

Winner: Sen. Claire McCaskill, D-Mo., one of the most vulnerable incumbents up for reelection, raised a strong $2.3 million and finished the quarter sitting on $6 million. (Liz Lynch)

Loser: In Michigan, Republican former Rep. Pete Hoekstra saw his numbers drop off by 30 percent, to $700,000, his worst quarterly outing as a Senate candidate. (ADAM BIRD/AP)

Loser: Democrat Hector Balderas managed to bring in just $127,000 and is running behind Rep. Martin Heinrich in his primary race. (AP Photo/Heather Clark)

Loser:Former Wisconsin Gov. Tommy Thompson outraised everyone else in the state's GOP field, but took closer: His $660,000 topped Mark Neumann's total by just $10,000 — and Neumann has the ability to write himself a big check at any point. (AP Photo/Dinesh Ramde)

Loser: Former Sen. George LeMieux, R-Fla., raised only $305,000 during the first quarter of 2012. His primary challenger Rep. Connie Mack more than tripled that number and the incumbent, Democratic Sen. Bill Nelson, has nearly $10 million in the bank. (AP Photo/Alan Diaz)

Loser: Rep. Joe Donnelly, D-Ind., raised just $312,000 during the first quarter. But he has a chance at beating Richard Mourdock if the GOP challenger defeats Sen. Richard Lugar in their primary. (AP Photo/Joe Raymond)

Loser: Virginia Republican George Allen didn't have a bad fundraising quarter, bringing in $1.4 million. But he spent more than half of what he took in. (CHARLES DHARAPAK/AP)