From Wired:

Carberry is the political director of the Mars Society, a nonprofit group that pushes relentlessly for human exploration and settlement of the red planet. He’s the point man for Operation President 2008, in which Mars Society members lie in wait for presidential candidates at campaign stops in the early primary states, then leap out to pop the question: As president, would you send a man to Mars?

And check out the website of the Mars Society. Glad to hear someone is keeping abreast of this important issue.