Post from Commonwealth Unbound

What would the political geography look like if Treasurer Tim Cahill challenged incumbent Gov. Deval Patrick in next year's Democratic primary? It would be Faneuil Hall and Tanglewood vs. Plymouth Rock and the Lowell Spinners, if past results are any indicaton. The map below gives us an early, mischief-making look at the contest that may or may not happen. It's a mash-up using the results of both men's last competitive primaries. Gre ...