Her question of the day yesterday is damn fine:
What is your political philosophy, in a single sentence?
Mine is pretty simple (and impossible for me to forget):
"Think of the kids."
For a broader philosophy, not merely political, I like Emerson (two sentences, sue me):
“The purpose of life is not to be happy. It is to be useful, to be honorable, to be compassionate, to have it make some difference that you have lived and lived well.”