(CNN) - Marco Rubio announced Wednesday that he's raised $3.6 million in the first three months of the year in his bid for the U.S. Senate in Florida.
The former Florida House speaker is battling Gov. Charlie Crist for the Republican party's Senate nomination.
The Rubio campaign says nearly all of the money brought in during the first quarter is designated for the primary campaign. Florida holds its primary on August 24.
The Crist campaign has not yet released its fundraising totals for the first three months of the year. Crist entered 2010 with a significant cash advantage over Rubio.
"I continue to be humbled and energized by the outpouring of support we're receiving from voters who deserve leaders willing to defend the principles that have made America an exceptional nation," says Rubio in an e-mail release. "Above all, we're encouraged by the strength of our limited government message and its ability to rally people around our cause. Today's announcement is a product of grassroots supporters that are stepping up to ensure we have the resources needed to promote this message throughout Florida."
Last summer Crist held a wide advantage over Rubio in public opinion polls in Florida, but Rubio's numbers have surged and he leads Crist by double digits in most recent surveys.
Rubio's support from conservative voters has helped fuel his rise in the polls.
Follow Paul Steinhauser on Twitter: @psteinhausercnn