As Donald Trump's meteoric rise to the top of the Republican presidential field shows some signs of waning, the also-rans are looking to cash in.

Donald Trump speaks to supporters during a campaign event in Dallas, Monday, Sept. 14, 2015. (AP Photo/LM Otero)

Already we have seen numbers start to improve for Gov. Chris Christie and some of the others.

Who has the most benefit if Trump starts to collapse?

Christie thinks it's him. He told Fox News on Sunday that many of Trump's supporters would have been his.

Trump has said that if his numbers drop, he would leave the race. Some say that's exactly what Christie is counting on.