I am unsurprised by his announcement, he never struck me as someone who enjoyed the “World’s Greatest Deliberative Body” (Hah!), but it means that it’s highly likely that whoever the ‘Phants nominate in 2012 will take the seat, which means that they will need only 3 more seats to take control of the Senate.
While from a numerical perspective, this is a bit of a bummer, from an ideological perspective, he was always a bit of a DINO, he served in Reagan administration, so I am not sad to seem him go from that perspective.