The best replacement for santorum is romney.

The best alternatives to santorum are rated as following:
★★★★★  romney
★★★★  casey
★★★  gingrich
★★  ayatollah
★★  mitt romney
★  romney differences
★  romney polls
★  ron paul
★  romney michigan
★  bob casey
  bob casey jr
  obama poll
  newt gingrich
  democrat bob casey
  palin
  robert casey

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Speaking about santorum, one probably shouldn't forget about chris wallace.

Other search terms related to santorum and their ratings are:
★★★★★ chris wallace
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