Sen. Hillary Rodham Clinton (D-N.Y.) just e-mailed an appeal asking her supporters to get behind Democratic congressional candidates in close races.

Since losing the Democratic nomination fight to Barack Obama, Clinton has hit the campaign trail on behalf of Obama in swing states and Democrats across the country. In her e-mail, she asks backers to donate to four candidates: Rep. John Murtha (Pa.); Ronnie Musgrove, the challenger to Sen. Roger Wicker (R-Miss.); Raul Martinez, the opponent of Rep. Lincoln Diaz-Balart (R-Fla.); and Ann KirkpatrickAnn KirkpatrickDemocrat O'Halleran wins reelection in Arizona House race Arizona Rep. Tom O'Halleran wins Democratic primary Arizona Rep. Ann Kirkpatrick wins Democratic primary MORE, who is vying for the seat being vacated by Rep. Rick Renzi (R-Ariz.).

"I went through the races with my political team one final time, and we picked these very important races in the country -- the ones right on the edge, the ones where your donation can make the difference with just a few days to go," Clinton wrote in her appeal.

Read a portion of Clinton's e-mail below:

In Mississippi, Ronnie Musgrove has shocked the pundits by pulling extremely close in his race to win a Senate seat for Democrats. His conservative, Republican opponent has even resorted to ads attacking me and my supporters. It's up to you to keep Ronnie's momentum going.

In Pennsylvania, my good friend John Murtha -- a strong supporter for me during the primaries and an important voice against the war in Iraq -- is depending on your help to win.

Raul Martinez in Florida has a great chance at picking up a Democratic seat from a conservative Republican incumbent. The latest polling has this race in dead heat and Raul needs our help to push back against Republican attacks.

And in John McCain's home state of Arizona, Ann Kirkpatrick has a very good chance to pick up a Republican-held seat. She'll be the first Democrat ever elected in Arizona's 1st district -- if you help her today.