If you don’t know already, Charlie Baker entering the race on Wednesday was a big deal. Despite his formidable resume, the Republican insurance exec is virtually unknown outside of political circles. Nonetheless, he pulled 36% against Patrick’s 41% in a hypothetical Rasmussen head-to-head a couple weeks ago.

Massachusetts Governor Deval Patrick speaks with the Brockton Enterprise on developing a regional drug strategy for the Bay State. Posted by the Enterprise, May 2007.