With less than a month until midterm elections, President Barack Obama attended a private event in Greenwich Tuesday to raise funds for Democrats.

Marine One landed at the Greenwich Polo Club just before the fundraiser in the gated community of Conyers Farm, where contributors donated thousands of dollars each to the Democratic Senate Campaign Committee.

Democrats are defending 21 Senate seats. Republicans need to win only six of those seats to gain control of the Senate, and for Sen. Mitch McConnell (R-Ky.) to become majority leader.

Around the nation, many Democratic candidates have kept their distance from the president because of his sagging pole numbers, but privately the candidates still appreciate the fundraising support. And while many polls favor Republicans, new surveys show Democrats making some gains. 

"If you were asking me this question a week or two ago, I would say, really, it does look as if Republicans are going to win their six seats," said Gary Rose, a political science professor at Sacred Heart University. "But right now, I'm not so sure of that as of today."

Sen. Richard Blumenthal (D-Conn.), who isn't on the ballet this year said earlier that he planned to attend the Greenwich fundraiser. He wants to see a more bipartisan Senate.

"A lot of the toughest races are separated by just a couple of percentage points one way or the other," said Blumenthal. "We're less than 30 days away from the election and a lot of these races could go either way."

The midterm election is .