Senate Majority Whip Dick Durbin (D-Ill.) rounded out the first quarter of the year with $3.23 million in his campaign fund, placing him in a strong position for a reelection run.
Last month, U.S. Durbin told other Democrats he intended on running for reelection.
The official announcement is expected in coming weeks.
Durbin, 68, raised more than $736,00 in the first quarter of 2013.
According a source close to Durbin's campaign fund, the senior senator from Illinois held about a dozen fund-raising events over the first quarter.
"Durbin's haul is impressive and shows he has continued to be a strong fundraiser even without a formal campaign announcement," said the source.
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