I'm working through older voting data right now, from 1999 to 2010. Over the past week I've been laboriously scraping that data from the General Court website.

Right off the bat, the results are striking. This is the House of Representatives in 1999:


There are so many moderates! There's supposed to be a gaping void in the middle!

So the hypothesis that the House is growing more polarized? Mark that one down as "confirmed".