I dunno.... sometimes it's better for satan to be ugly - - he's easier to recognize that way.
RINOs (like Jeffords was) turn my stomach more than nearly any rat, except maybe for pukes like Leahy and Boxer.
If the RINO intends on getting any Republican money, backing, support or committee positions, the senator MUST vote the party for Senate leader. This is the only reason a RINO beats a RAT, but it is a big one.
Jeffords felt he had to renounce his Republicanship so he could remove his vote for the Republican Senate leader candidate.