That was a rather nice explanation.
It explains why folks voted to Hitler.
Now, that is just plain silly; you're not even on the same page here.
Suppose one is a conservative.
Suppose the U.S. Senate has 49 Barry Goldwater conservatives in it, the other 51 being Democrats.
Well, that's all fine and good that the 49 are ideologically pure, purely conservative.
But they aren't doing conservatives any good; they're the minority party, and the majority party runs the Senate and pushes the programs and policies. No matter how good these 49 guys are, all they can do is delay or obstruct or detour; they aren't going to have any luck pushing any conservative agenda.
Suppose there's a chance to elect two more Republicans, making the Republicans the majority.
Suppose those two are Nelson Rockefeller Republicans, ultra-liberals, but that once elected, they can be trusted to keep that (R) after their names, ensuring the Republicans control the Senate.
That is a damned good reason for a conservative to vote for a liberal Republican, as I argued with my bull-headed cousins in Pennsylvania during the Arlen Specter-Pat Toomey primary battle. Specter was a sure hold on that Senate seat, but if Toomey instead were the Republican candidate, whoever the Democrat was, was in, thus the Republicans losing that Senate seat.
Well, they didn't like Specter, way too far to the left, just one person removed from Vast Teddy.
So they'd rather vote for an ideologically pure candidate sure to lose, than vote for a candidate sure to win, but who wasn't ideologically pure. But he was (is) an (R}, and would help the (R)s remain in control of the Senate, and since 49 out of 51 (in this theoretical case) were rock-hard conservatives, conservative ideas, policies, and programs would advance.
This was proven during those two Supreme Court nominations; Specter paid any dues he owed conservatives, getting those through with a minimum of fuss and disorder.
If Toomey had gotten the Republican nomination and inevitably lost, giving control of the Senate to the Democrats, do you for a minute think a Democrat heading the Senate Judiciary Committee would have pushed those through?