For those living in a cave, Dennis Kucinich, that bastion of moderate politics, has questioned Bush's Mental Health. http://abcnews.go.com/Politics/Vote2008/wireStory?id=3795902
It would seem that the questions of mental health should be following the other 3 fingers: http://weblogs.baltimoresun.com/news/politics/blog/2007/10/kucinich_i_did_see_a_ufo.html
And he still gets elected.
(Editors note: for those wondering about the "3 fingers", point at some one and see where the rest of the fingers are pointing)