I will enthusiastically pull the lever for Allen, but stay home if McLame or Guliani get the nom. I have a feeling some "moderate" will run third party and siphon votes away from the GOP, thereby ushering Hitlery into office. The little bolsheviks like to b*tch about Nader, but he is nothing compared to Perot in that sense.
There's always the option of voting for a third choice. Even if you don't like any of the third parties listed, you can still write someone in. It would send a more effective message than staying home.
Don't stay home! Show up and write-in George Allen :o)