John McCain accepted the endorsement of Texas megachurch pastor John Hagee in 2008, the result was a PR disaster. After critics pointed to Hagee's incendiary views on gays (whom he held responsible for Hurricane Katrina) and Catholicism (which he described as a "false cult"), the Arizona Republican called Hagee's views "crazy and unacceptable" and renounced the endorsement.
But three years later, Hagee is once more involved in Republican presidential politics. Later this month, he'll host former House Speaker Newt Gingrich, a 2012 aspirant, at Cornerstone Church in San Antonio. For the candidate and the pastor, the summit is a chance for two controversial figures to help each other back into the spotlight—though a Hagee spokesman says the pastor has no plans to endorse Gingrich.