As seen on Space Politics:
MARS - NASA received a signal today from the twin to their successful Spirit rover, indicating that it is dropping out of the Democratic presidential primary. "With my need now to focus on my Martian duties," the rover said, "I can't devote enough time to campaigning. I have learned a lot from this experience, I wouldn't trade it for the world. But it is time to step aside and throw my backing behind the next president of the United States, Howard Dean." Dean's spokesman indicated that the endorsement was unexpected, but appreciated.
It's funny, read it. :D And it's just one more confirmation that Spirit and Opportunity are female.