The Democratic Senatorial Campaign Committee outraised its GOP counterpart $5.3 million to $3.6 million in June, according to numbers disclosed by aides to both committees.
The DSCC's cash on hand and debt numbers were not immediately available. The committee had $9.6 million in cash and $12.5 million in debt at the end of May.
The National Republican Senatorial Committee, meanwhile, for the first time has more cash than debt, with $7 million in cash and $6.5 million in debt at the end of June.
The DSCC has outraised the NRSC $27.4 million to $17.7 million so far this year -- owing mostly to a slow start for the GOP. But the two committees are in relatively similar position when it comes to their finances heading into the 2014 election.
"Over the past several weeks, there has been growing excitement among our supporters about the prospect of defeating Mitch McConnell and protecting the majority," DSCC executive director Guy Cecil said in a statement provided to Post Politics. "It is early in the cycle, but our supporters are already giving generously to build the strong organization we need to push back on false Republican attacks and mobilize voters."
A spokesman for the NRSC said his committee remains in good position to steal six seats and win the majority.
"Democrats are feeling their majority slipping away after failing to recruit good candidates in important states like West Virginia, Montana, South Dakota, and Georgia, and their committee is drowning in debt," said the spokesman, Brad Dayspring. "Meanwhile they're wasting important resources on wing and a prayer candidates like Alison Lundergan Grimes instead of saving Mary Landrieu, Mark Begich or Kay Hagan."
Updated at 12:23 p.m.