As a myopic provincial, the figure I conceptualize in my mind as politically representative of New Englanders is a theistically ambivalent liberal white Protestant. A SWPL, basically. N/A, proprietor of R/H/E Notes, who has set me straight on misconceptions in the past, may have done so again by showing that Romney enjoyed a comfortable edge among white Protestants in New England in last November's presidential election.
The GSS allows us to look back almost as far as LBJ and the Great Society to see how white New England Protestants have voted over the last forty years. To avoid regional skews (self-identified New England Republicans tending to be to the left of Republicans on the whole, etc), only presidential elections are considered. The following graph traces the percentages of white New England Protestants and the national popular electorate as a whole who voted for the Republican candidate over the last four decades of US presidential elections as though there were only two tickets to choose from:
Sample sizes are small, in the 50-100 range for each election, so some sampling error is surely present, but the trend is clear--most Protestant white New Englanders find their seats on the right side of the national assembly hall. Only in 1996 do they appear more Democratically-inclined than does the public, and then only marginally so. If they built the Cathedral, they haven't been its most pious votaries.
GSS variables used: PRES68, PRES72, PRES76, PRES80, PRES84, PRES88, PRES92, PRES96, PRES00, PRES04, PRES08, RELIG(1), RACE(1), REGION(1)