Tom Vilsack has dropped out.  I wonder if Vilsack voters in Iowa will now migrate to a new fourth candidate, such as, say, a slightly portly New Mexican.  It’s worth noting that there are now no other candidates running as centrist Democrats besides Richardson.  Is this the cycle where being the boring, “electable” centrist is actually a disadvantage?  Maybe.   

Update: I guess my confident declaration that Iowa was a “lock” for Vilsack was a bit off.