best case scenario is Lieberman loses the primary Tuesday, the rats turn their back on him, then he wins the state election as an independent in November...
...and then caucuses with the GOP thereby voting for a Republican for Senate Majority leader.
How about a Republican coming up the middle to win on a Democrat vote split?
No, the best case scenario is that the Dems' votes are split and a Republican wins. Senator Lieberman happily voted for amnesty (willing to sell out this country).