He's not. The race is actually kind of close:
Or…is it? Consider, for instance, this revealing cross-tab:
Among likely voters, Charlie Baker is dominating Republicans, boasting a 40 point advantage among Independents (by far the biggest voting bloc in the state), and peeling off a plurality of Democrats (for Massachusetts, that is). My gut reaction, then, is if he’s siphoning off so many votes, how has he not opened up a much safer lead?
Answer: Welcome to Massachusetts.
Only in Massachusetts, for example, would the president’s approval ratings be higher than 50 percent and above water.
Nationally, he fares much much worse. On the other hand, not only does Charlie Baker have lower disapproval numbers than his opponent (see above), but he is also “personally more likable”: