The two parties' House campaign arms each raised $9 million in June, impressive sums for both. The Democratic Congressional Campaign Committee now has nearly $34 million on hand, a two-to-one advantage over the National Republican Congressional Committee's $17 million.

The NRCC announced its June haul at a press briefing this afternoon. NRCC Chairman Jeff Sessions said it was the committee's best June total since June 2006, and the party now has $8.5 million more in the bank than at this time in 2008.

Democrats, who released the numbers in a brief e-mail, were expecting to be outraised last month but turned in a good month of their own. The DCCC notes that at this point in 2006, the party had a nearly $5 million cash-on-hand advantage over the NRCC.

Both committee's June fundraising numbers were an improvement from May, when the NRCC raised $5.4 million to the DCCC's $5.1 million. At the end of May, the DCCC had $28 million to the NRCC's $12 million.

On the line is majority in the House, as Democrats try to hold on to a 39-seat lead. With Democrats down in generic ballot polling and President Obama's approval rating below 50 percent, Republicans are moving forward into the last three months of the election cycle with a majority-or-bust attitude.

"Midterms are always a referendum on the party in power," Rep. Greg Walden (R-Ore.), deputy chairman of the NRCC, told reporters today. "And this is the mother of all referendums."