I would, and the first thing I would try to do would be to try talking him out of running. I would campaign for him in spite of the fact that I don't believe that he has a snowball's chance in hell, and fully cognizant that my efforts would be wasted insofar as he (Keyes) is not building a constituency in my State to be called upon in the next election cycle, and that would truly turn me off.
I would also vote for him because I am a Republican, but I would be truly dissapointed at the position that my State's GOP put me in where my time campaigning for a candidate would be wasted , along with my vote.