THINKPROGRESS: What do you think is happening here?
DANFORTH: An effort by some, and apparently a large number, 60% in Indiana, to purge the Republican Party and to create something that’s ideologically pure and intolerant of anybody who does not agree with them — not just on general principles, but right across the board.
THINKPROGRESS: Do you stand by your view that GOP is beyond hope?
DANFORTH: If this trend succeeds, yeah. What they will be left with, if indeed they want to purge the party of all but people who have a particular ideological slant… it’s not a way to win elections, it’s not political[ly] sustainable. It might make them feel good for a time but doesn’t work, it hasn’t worked. It didn’t work in Nevada or in Delaware in last election. They won nominations but couldn’t win elections. I don’t know how you win elections without getting 51% of the vote. I don’t see how you’re gonna get 51% of the vote if you make it clear that people in your own party, who don’t absolutely agree with everything you want to do, aren’t wanted.
[Bolding mine]