From People’s interview with George, Laura, Barbara & Jenna Bush:

People: Do you think there is any chance you are the last Bush in the White House?
President Bush: No. My dad set, you know, a great example of public service, and he showed that you could go into the political arena with a calue system and come out with the same value system. You can go in as a loving person and come out as a loving person, that politics doesn’t change you. Plus, to serve your nation is a great honor. [But] I can’t tell you who it’s going to be.
Jenna: Not us. [Laughter]