A RINO will at least vote with us part of the time. A Demonkat will NEVER vote with us!
Unfortunately, the national Republican party routinely supports incumbents regardless of how odious the person is.
Two clear pond scum examples come to mind: Lincoln Chafee and Arlen Specter. Both would have been defeated in the primaries, and deservedly so, if the national party had not come to their rescue.
I no longer contribute a penny to the national party as a result.
Sadly, when the time comes, I will almost always hold my nose and vote for a miserably worthless RINO Republican rather than an outright pond scum Democrat. But I no longer buy the "do it in the primary" argument.
Since Lincoln Chafee does not rise to the minimum standard of "miserably worthless RINO", I would not vote at all rather than vote for Chafee.