The Democratic Senatorial Campaign Committee raised more money than its Republican counterpart in September, increasing its fundraising advantage for the year to $13 million.

The DSCC raised $4.6 million last month and ended September with more than $10 million in cash on hand, the committee announced on Wednesday. A committee spokesman said the DSCC has also paid down its debt to $7.5 million.

The National Republican Senatorial Committee announced it had raised $3.4 million in September, during which it also paid off the remainder of its debt. An NRSC spokesman said it will report having $3.4 million on hand as of Sept. 30.

The fundraising announcements come just after the filing deadline for Senate candidates and on the day of the New Jersey Senate special election. If Newark Mayor Cory Booker wins tonight, as expected, Republicans will have to pick up six seats to win back the majority in 2014.