Sen. Michael Bennet (D-Colo.) announced Wednesday that he raised $1.24 million in the second quarter, besting the totals released by two potential Republican rivals.

Republican Senate candidate Ken Buck reported raising $417,000 in the second quarter, while former Lt. Gov. Jane Norton's (R) camp said she pulled in some $900,000.

Former state House Speaker Andrew Romanoff (D), who got some last-minute fundraising help from Bill Clinton, has yet to release his numbers.

In its announcement, Bennet's campaign emphasized the more than 20,000 donors who contributed. He did not release a cash-on-hand total. Bennet reported close to $3.5 million banked at the end of March. He's raised $7.44 million to date. Norton and Buck both have close to $600,000 cash on hand.

— Updated at 9:53 a.m.