Bush, Cheney, Rove and Blackwell named as defendants

I was a little surprised to learn that Arnebeck's lawsuit (which has been refiled) names Bush, Cheney, Rove and Blackwell as defendants. Consider: Arenebeck, it is said, is a friend to John Kerry. A lawyer associated with a losing presidential candidate has sued the opposing candidate and his chief of staff. Does this situation have any precedent in American history?