Given the state of Massachusetts' liberal leanings, the GOP needs all the people they can get to actually win elections. Not a good time to promote the divide-and-conquer mentality in the Mass GOP and try to run out the "RINOs".
Of course, the REAL RINOs are people like Jesse Helms, Trent Lott, and Bob Barr -- the ex-Democrat segregationist sympathizers who have helped turn the GOP into a party that Theodore Roosevelt or Abe Lincoln wouldn't recognize.
I would be very interested in seeing your documentation for making that statement, particularly in regards to Senator Helms.
From encycopedia.com ......
A radio broadcasting executive, Helms gained prominence in the 1960s as a staunchly conservative Raleigh, N.C., radio commentator. Elected (1972) to the U.S. Senate as a Republican from North Carolina, he gained notoriety for his outspoken, often unyielding support of right-wing causes in the Senate. He has championed a strong military establishment and prayer in the public schools while opposing gun control, abortion, and government support for the arts. Helms has chaired the Senate agriculture committee (1981-87) and foreign relations committee (1995-).
I don't see anything there to indicate that Helms was ever a Dem. I'm still looking but will be eager to see your documentation in support of your position.