In the wake of her third Republican opponent’s official entry into the race, Sen. Kirsten Gillibrand announced this afternoon that she has raised more than $8.75 million since she took over last winter, including $1.6 million during the first three months of 2010.

Gillibrand had $5.16 million on hand as of the end of December 2009 and had spent $2.18 million.

The junior senator’s campaign did not offer any additional information about her filing, which isn’t due with the FEC until tomorrow, technically speaking. So, we have no details about her burn rate, number of individual contributors, etc.

The campaign did release a response to shots fired at Gillibrand this morning by her newest GOP opponent economist David Malpass.

“As chief global economist for Bears Stearns, David Malpass not only helped cause the financial collapse, he made millions and left taxpayers holding the bill,” said Gillibrand spokesman Glen Caplin.

“Senator Kirsten Gillibrand will take a back seat to no one when it comes to fighting for New York families and creating good-paying jobs in our state.”

It’s a fairly safe bet that Gillibrand, who is something of a fundraising machine, is going to have a lot more on hand to spend than any of her opponents, particularly her lone Democratic primary challenger, Jonathan Tasini, who had raised $102,006 as of the end of last year, had $20,916 on hand and $5,482 worth of debt.