An interesting lack of research on the part of the Obama re-innaugral team; they had Louie Giglio of Passion conference semi-fame slated to give the benediction at the ceremony... until folks on the left noticed that he had had a sermon against homosexuality late last century. Giglio isn't one of your usual suspect theocons, but he is (as best I can tell) an orthodox evangelical, which should have raised a pink flag for your research team.
The one thing that comes to mind is that opposition research is done on your opposition. Giglio showed up on Obama radar for his work on the world slave trade, so they might have forget to check the guy's theology to see if it'd tick off their base, since he seemed like an ally on that issue.
Giglio seems to be a good guy, just not a PC one. Politically incorrect preachers need not apply, it would seem.