McCain's Hagee problem

So McCain has renounced Hagee, insisting that he didn't know that Hagee was so full of stupid ideas as the past few weeks have shown to be the case.
I have a question: before you aggressively pursue the endorsement of a religious leader like Hagee or Parsley, wouldn't it be worthwhile to spend a little time finding out if they have said anything that oppo-research might jump on????

Yours, in be/a-musement,
N.