Sorry, but someone's chain is being yanked.
If you do the math, Lieberman Jumps, senate becomes 50-50, Republicans have control...If the GOP promises Lieberman the chairmanship of the Homeland Security Cmmte, i cant see why he wouldnt jump.
If he jumps from the "51" ship to the "49" ship, then it's a "50-50" ship and the original "51" ship (D) just turned into a "49" ship and the original "49" (R) ship just turned into a "51" ship with the Veep's tie braking vote!