Obama kicks off watermelon belt tour.

However, this one might be :

Obama conducts US vitner tour.

Or maybe not. But it's not quite offensive either. But I don;t think it's just offensiveness that's the bad thing because

Obama to sample milkmaid's jugs

while being enough of an entendre to get it, but not funny to laugh at, is still not out of the question for humor (or at least my sad attempts at the moment).

Well, I guess the bottom line is that we each have our individual consciences to deal with these things (which of course predates PC. I beleive it used to be called tastefulness of tact), on one hand, and on the other hand, some people will be bothered by everything (I wasn't bothered by this one, -the funnier something is, the more they can get away with- but I thought it was a chance to examine the topic while it's out there) .