Santorum endorses Cardon in Ariz. primary showdown against Flake

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Santorum's endorsement comes after Sens. Jon Kyl and John McCain, both Arizona Republicans, endorsed Flake in the increasingly contentious primary. And the Club for Growth, the prominent conservative organization, also pledged to spend half a million dollars on advertisements supporting the Arizona lawmaker.

Cardon now hopes that Santorum can rally Tea Party conservatives in the state. A poll released late last month by Magellan Strategies found Flake with a 22-point lead in the primary battle, despite Cardon's million-dollar ad blitz against the six-term congressman.

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