He could just as well abstain with the exact same effect.
Any freeper who buys the "Lieberman is worth voting for because a 90% liberal candidate is better than a 95% liberal candidate" arguement might as well vote for likes of Hillary over the Green party candidate in states where Republicans "can't win". Same logic.
DemocRATs in "safe" GOP states would never abandon their own "unelectable" candidate and vote for a 90% conservative candidate who disagrees with conservative activists on one issue (example: Chris Cannon) just to send a "symbolic" message in support of amnesty for illegals or other such nonscene. They know a vote for Cannon would simply help Hastert keep the House.
Loserman tried to hijack the 2000 election and I, for one, will never forgive him. Vote Schlessinger.