I would hesitate to declare that a single-state election is a proxy referendum for the nation. I mean, hey, you're free to declare that it's a referendum on the entire galaxy if you like, but I think it's a bit much.

Fivethirtyeight does some number crunching on the spectacular 31-point swing from a 26-point Obama win in 2008 to Coakley's 5-point loss yesterday.

At a bare minimum, 10 of those points must be assigned to the national environment. Generic ballot polling suggests that the Democrats' position has worsened by a net of 10 points since November 2008, from winning the House popular vote by 10 points in 2008 to being dead even with Republicans today.

Also at a bare minimum, 11 points of blame should be assigned to Coakley. That represents the difference between the 58 percent of vote that she received at her high-water mark in the polls to the 47 percent she received on Election Day. A fairly large number of voters, it appears, actually turned away from Coakley; it was not just a matter of undecided ones turning toward Brown.

That leaves us with 10 more points of blame to assign; let's just dole those out as evenly as possible, giving 3 more points to Coakley, 3 more points to the national environment, and 4 to Massachusetts-specific special contingencies -- it gets the extra point because it hadn't received any yet.

That would make the final score: national environment 13, Coakley 14, special circumstances 4.

If you follow through on the math, this would suggest that Coakley would have won by about 8 points, rather than losing by 5, had the national environment not deteriorated so significantly for Democrats. It suggests that the Democrats would have won by 9 points, rather than losing by 5, had the candidate been someone other than Coakley. And it suggests that the race would have been a 1-point loss (that is, basically too close to call), rather than a 5-point loss, even if Coakley had run such a bad campaign and even if the national environment had deteriorated as much as it has, but had there not been the unusual circumstances associated with this particular election.

Obviously, this is a rather imprecise and unsophisticated exercise. But each of those implications feels about right to me. Maybe you'd do the math a little differently. But don't be sparing with your blame; there's plenty of it to go around.