Waltham is a bellwether? Huh.
Personally, I think it's ridiculous to call Waltham a bellwether too. Considering how fluid the map is, it's ridiculous to call
any town a bellwether. The Brown '10 path to victory was quite different from the Romney '02 path to victory, which isn't even recognizable when compared to the Weld '90 path to victory.
And besides, there's no real challenge to Ed Markey for the House race (unlike, say, the challenge to Barney Frank), so turnout is likely to be lower there, on average, than in MA-04, MA-05, MA-06, and MA-10.
The only interesting thing here is that undecideds are breaking "strongly" for Baker when pushed, which could make for an interesting night.