Marco Rubio raised more than $4.5 million in the second quarter, his campaign said, beating rival Charlie Crist's previous record.

Crist raised $4.3 million in his first fundraising quarter of the race, back when he was a Republican, a national record for the cycle. Crist has not released his current haul. Democratic challenger Kendrick Meek said last week that he raised $1 million.

Among Rubio's contributors: U.S. Sen. George LeMieux, Crist's former right hand man. LeMieux contributed $2,400 through his PAC. Earlier this year, LeMieux gave $2,400 to then-Republican Crist's campaign.