U.S. Sen. Michael Bennet raked in more than $2.1 million in the final three months of 2021, surpassing the Colorado Democrat’s own record for an off-year quarterly haul and boosting his re-election war chest to more than $4.7 million, his campaign said Wednesday.

The sum brings Bennet’s fundraising total for the 2022 midterm cycle to roughly $8.7 million as the primary field of his potential Republican challengers is still taking shape.

“Michael Bennet works hard and delivers for Colorado workers and families,” said his campaign manager Justin Lamorte, in a statement. “Grassroots donors shattered fundraising records to keep him representing Colorado in the U.S. Senate and gave Michael’s campaign tremendous momentum heading into the election year.”

Bennet’s previous quarterly record for contributions in an off year was set last quarter when he reported raising $2,079,235. That total just barely edged his more long-standing high mark, set in the first three months of 2015.

The one-time presidential candidate’s campaign said 94% of the contributions it plans to report for the quarter were in amounts under $200, matching the share of small-dollar donations recorded in the previous two quarters. The campaign counts donors this year from all 64 counties in Colorado.

Bennet, who is seeking a third full term in this year’s election, is the only incumbent senator running in 2022 who isn’t taking contributions from corporate political action committees and federal lobbyists, his campaign notes.

Bennet’s campaign spent about $900,000 for the quarter, though final figures weren’t available.

Two of Bennet’s leading Republican challengers plan to report raising in the neighborhood of $1 million apiece for the quarter, Colorado Politics has reported. Construction company owner Joe O’Dea’s campaign took in just over $1 million, and Fort Collins developer Gino Campana had receipts of around $950,000, their campaigns said. Both candidates said they put roughly $500,000 into their campaigns.

The other six candidates running in the GOP primary have yet to release their totals for the three months ending on Dec. 31. Fundraising reports for the fourth quarter are due to the Federal Election Commission by Jan. 31.

National election forecasters at the Cook Political Report rate the Colorado seat as “solid Democrat,” suggesting the race will be less competitive than toss-up races for Democratic-held seats in Arizona, Georgia and Nevada and GOP-held seats in North Carolina, Pennsylvania and Wisconsin.

Democrats are defending the slimmest of working majorities this year in the Senate, where the party holds 50 seats plus a tie-breaking vote from Vice President Kamala Harris.