After gun-control legislation was defeated last month, Senate Democrats now believe that they may have several new votes in favor of a bill that would expand background checks for gun buyers.

The Huffington Post notes "the bullish talk from Democrats — from leadership on down — is yet another indication that the party feels good about the fallout from the failed gun vote and is increasingly eager to try again."

One of these votes currently in play may be Sen. Johnny Isakson (R-Ga.), who sponsored a background check bill on the state level in Georgia, according to Greg Sargent.

Another may be Sen. Kelly Ayotte (R-N.H.), who has faced a wave of intense criticism — and falling polling numbers — after she voted against the measure last month. Ayotte wrote an op-ed suggesting she may support measures to strengthen the existing background check system.

Finally, Sen. Jeff Flake (R-Ariz.) — who apparently switched his position at the last minute — told CNN that he is willing to reverse his opposition to expanding background checks if the bill is changed in how it deals with internet sales.

The White House vows gun-control legislation will be back for a vote in the Senate. These wavering Republicans make that prospect increasingly likely.