President Barack Obama will have to scale back his domestic agenda after finishing work on healthcare, one Democratic senator said Monday.

Sen. Bill Nelson (D-Fla.) said that Obama would need to ramp down some of his plans in the months ahead if some of the most vulnerable Democrats are to go on to win this fall.

“I think the president is going to have to scale back his agenda after we pass healthcare reform," Nelson said during an appearance on "Good Morning America."


"Then I think some of those folks we think are in danger, like Sen. Harry Reid of Nevada, I think you’ll see they’re going to win," Nelson added, making reference to the Senate majority leader, whose poll numbers have shown a tough reelection battle looms this fall.

Nelson, a relatively centrist Democrat, suggested that while Obama has centrist instincts, he's allowing the party's liberal base to exert too much influence.

"I think he’s allowed the left wing [to] pull him too much in that direction," Nelson said. "But he always comes back into the center.”

Nelson also suggested that scaling back ambitions on healthcare could boost efforts to pass reform legislation, potentially with the support of Republicans like Sen. Olympia Snowe (Maine). He cautioned, though, that the existing Senate legislation is still a good bill. 

"It would have to be a scaled-back bill,” Nelson said of what it would take to win Snowe's vote. “But I’ll tell you, the Senate bill is a good bill.”