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Sen. Claire McCaskill (Photo/Getty Images via Daylife)

— Senator Claire McCaskill, D., heads into reelection year with deep pockets, according to new numbers released by her campaign.

In a tweet Thursday afternoon, McCaskill campaign manager Adrianne Marsh said the campaign has nearly $5 million on hand, and raised $1.4 million of that in the last quarter of 2011.

“Hard work from @clairecmc & team paid off again last quarter,” Marsh tweeted. “[It was] our biggest fundraising quarter yet.”

A source familiar with McCaskill’s fundraising totals told PoliticMo nearly two thirds of her donors gave $100 or less.

None of McCaskill’s Republican opponents have yet released their fundraising totals, but former State Treasurer Sarah Steelman and Rep. Todd Akin, two of the contenders, have underwhelmed in recent fundraising quarters. McCaskill’s third opponent, St. Louis businessman John Brunner, is self-funding at least some of his campaign. His operation has been funded well enough to purchase multiple statewide ad buys.

The deadline to file with the Federal Election Commission is January 31.