President Barack Obama says there’s “nothing” he “would have done differently” about his economic stimulus plan, but one of his top outside economic advisers says the plan was “a bit too small.”

Democratic Sen. Claire McCaskill of Missouri says the idea of a second stimulus is a “non-starter,” but Democratic Sen. Sheldon Whitehouse of Rhode Island says it “should be on the table.”

Senate Majority Leader Harry Reid (D-Nev.) says there’s “no showing that a second stimulus is needed,” but House Majority Leader Steny Hoyer (D-Md.) says Congress needs to be “open to whether we need additional action.”

Democrats are all over the map on the stimulus and the possibility of a sequel, and it’s not hard to see why:...