Democratic Senatorial Campaign Committee Chairwoman Patty Murray (Wash.) expressed confidence in her party’s ability to hold the majority this fall, but also bemoaned the influence of outside of money in Senate campaigns.

“Despite the difficult and very tough map and despite the fact that everybody wrote off our chances when I took on this task almost two years ago, we are doing really great and I feel confident going into the election,” Murray told reporters this morning. “The only thing that stands between me and a long good night of sleep is the outside money that is coming from Karl Rove and the right-wing billionaires that are funding these races and campaigns across the country.”

Five of the seven races that Roll Call rates as Tossups are held by Democrats. Winning most of these races is crucial for the party if it hope to keep a majority. Murray repeated Democratic talking points on Social Security and Medicare to argue that the party’s message will resonate with voters. She also said that the strengths of individual Democratic Senate candidates have left the party especially well positioned heading into the fall.

“I think these candidates are so great personally, they know their states, they are fighting hard, they are out doing what they need to do, raising their money, meeting their constituents, fighting for the things they believe in,” she said. “We have the right agenda that the American people support. That’s what gives me confidence.”

Despite her confidence, Murray declined to share her thoughts on the odds that Democrats will retain control of the Senate. Majority Leader Harry Reid (D-Nev.) has previously said that Democrats have a 50-50 shot.

“In terms of odds, I am not from Nevada so I don’t do odds,” Murray said.