Now that the one-time GOP frontrunner has suspended his campaign, Republican candidates are scrambling to win Herman Cain's supporters.

Cain suspended his campaign Saturday amid allegations of infidelity and sexual harassment. Cain said he came to his decision because "false accusations" were hurting his family, and distracting voters from Cain's ideas for the country.

Rick Perry's campaign pounced at the chance to showcase the Texas governor as Cain's only true heir apparent. The campaign's website touts Perry as the only true "Washington outsider" left in the race, setting up a special page aimed at Cain's supporters.

Rep. Michele Bachmann boasted Sunday that many of Cain's supporters had been calling her office.

Meanwhile, former House Speaker Newt Gingrich's meteoric rise has been largely connected to Cain's fall, according to many political analysts. Gingrich hit the airwaves Monday in Iowa with his first TV ad of the campaign season, trying to keep the momentum going as two new polls showed him leading the GOP race a month ahead of the state's caucus.

Most of the candidates plan to campaign in Iowa this week as they try to round up votes ahead of the caucus, and win over Cain's supporters.