Democrat Richard Blumenthal has raised more than $1.6 million in the third quarter of 2010, according to the campaign.
In addition to the money collected from donors, Blumenthal lent his campaign $500,000.
The candidate's third-quarter filing covers the period from July 1 through Sept. 30. The full report is due to the Federal Election Commission by Oct. 15.
Blumenthal's opponent, Republican Linda McMahon, has said she will spend up to $50 million of her own money on her campaign.