Former governor Tim Kaine (D) will announce Tuesday that he raised more than $2.25 million for his U.S. Senate race during the three months that ended June 30, according to his campaign.

Kaine, former chairman of the Democratic National Committee, received more than 4,600 donations after launching his campaign April 5. His campaign did not release information about the total cash he has on hand.

“Tim Kaine has laid out an optimistic vision of bringing Virginia answers to Washington to help address serious national problems,’’ Kaine spokeswoman Brandi Hoffine said. “We are pleased with how many people are responding to this campaign in its first weeks.”

Kaine’s chief Republican rival, former governor and senator George Allen, has not released his fundraising numbers for the 2nd quarter. Those figures are due July 15.

In the first three months of the year, Allen raised more than $1.5 million to help him compete in a crowded Republican primary.

“As expected, liberal special interests have begun lining up to support and fund Chairman Kaine’s campaign,’’ Allen spokesman Bill Riggs said. “The reason is clear: they know that Chairman Kaine would be a reliable vote in the Senate for President Obama and the Washington Democrats’ pro-spending, pro-union, pro-big government policies that he championed as chairman of the Democratic National Committee.”