Rep. Gary PetersGary PetersDemocrats make final plea for voting rights ahead of filibuster showdown Michigan Republican John James 'strongly considering' House run Officials point to Apache vulnerability in urging passage of cyber incident reporting bill MORE (D-Mich.) raised $1 million in the last three months of 2013, according to numbers provided to The Hill, continuing his steady fundraising pace but falling behind the $1.66 million his Senate opponent pocketed in the same time frame.

Peters has consistently posted $1 million quarters since he got into the race. Former Michigan Secretary of State Terri Lynn Land (R) matched his $1 million quarter and added $600,000 from her own pocket, part of the $5 million she's promised to spend in the race.

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Neither candidate has announced how much cash on hand they have. As of the end of September, Peters had $2.5 million in the bank while Land had $1.9 million.

"The overwhelming support from Michiganders hailing from all 83 counties shows that Gary is the only candidate earning the trust of middle class families and small businesses, and he is a proven independent voice for Michigan," Peters for Michigan Campaign Manager Julie Petrick said in a statement to The Hill.

Republicans are increasingly bullish about their chances in Michigan, where Sen. Carl Levin (D-Mich.) is retiring. Democrats believe they still have the edge, but Land's ability to self-fund is making some nervous.