Freshman Rep. Jim Marshall (D-Ga.), who has been eyeing a run for the Senate, underwent surgery today for prostate cancer at Johns Hopkins Medical Center and is expected to make a full recovery, according to a top aide.

Communications Director Doug Moore said Marshall has not made any decisions about his political future — whether in the House or the Senate. Moore added, however, that a potential Senate bid has been “on his mind.”

Marshall, 55, went into surgery at 2 p.m. at the same prominent Baltimore hospital where presidential hopeful Sen. John Kerry (D-Mass.) underwent the same procedure in February. Marshall’s physician is Dr. Patrick Walsh, the urologist-in-chief who treated Kerry.

Kerry, whose father died of prostate cancer, has continued his White House bid without pause.

“The operation could not have gone better,” said Walsh. “Everything looked contained, and Jim is doing extremely well.”

Marshall’s cancer likely resulted from his exposure to Agent Orange while serving in the Vietnam War. The toxin is believed to cause both skin and prostate cancer.

“It’s almost certainly a reaction to that,” Moore said.

The Georgia freshman has yet to announce whether he will run to succeed Democratic Sen. Zell Miller, who will not seek re-election to a second term. So far no Democrat has entered the race, which has already drawn three Republicans.

Democrats are also actively wooing former Sen. Max Cleland for the seat.