Well, because she's my friend, of course.
I know that Charlotte is both committed to the welfare and well-being of others, and intensely practical -- a combination that I think makes her a great asset to any sort of public office.
Oh, and because I'm godfather to her children. So if she gets elected I can say "Someday - and that day may never come - I'll call upon you to do a service for me." Over and over, until she's sick of it.