Eh, I figure that when you have as big a majority as the Massachusetts Democratic Party does, you can be as blatantly partisan as you want.
Except partisan in Massachusetts speak is Anti- and Pro-Deval Patrick. Kennedy and Kerry are clearly in Patrick's court, the legislature clearly against them or at least its leadership. The leadership not only ruled out this rule change when Kerry was looking to be appointed Secretary of State, but ruled up even allowing it for a vote. So far, they have indicated they have zero intention of changing the law.