Senate Democrats' campaign arm raised roughly twice what its GOP counterpart brought in last month, collecting $4.3 million to Republicans' $2.17 million.

The Democratic Senatorial Campaign Committee ended the period with $5.1 million in the bank, while the National Republican Senatorial Committee wrapped the month with $3.1 million in the bank and $9.5 million in debt. The DSCC didn't immediately disclose its debt level; it was carrying about $15.7 million in debt at the end of January.

Senate Republicans need to pick up six seats to reclaim the Senate majority in 2014.

Sean Sullivan has covered national politics for The Washington Post since 2012.