chris shays (R-CT) endorses lieberman...

[Q]

These endorsements make the most sense for the candidates.

Shays needs to appeal to Dems; Lieberman needs to appeal to Dems.  Both are more popular among Repubs than Dems, so this makes perfect sense.

[Q]

If GOP Joe had endorsed Shays, it probably would have been the last straw for a lot of Dems.

I met Ned Lamont, his Dem primary challenger, last week, and I was extremely impressed.  He'll give it a good run, and would have a shot if Lieberman does stupid things like endorsing Repubs.