Agree on JFK. He's the last President to truly practice supply side economics.
Clinton was more conservative in some measure than was Bush.
The base has moved to the right on deal breaker issues like the 2nd Amendment. Reagan passed laws supporting gun control (broad term). NO GOP candidate today could do that. Since 9/11 the hawks are running things. The GOP model of diplomacy is based on John Wayne. That's doing nothing but playing wackamole and is a loser in the long term. Say all you want about Bush's Medicare Modernization but his 12 year war in Iraq in the face of tax cuts is the silliest thing I've ever seen.
The issue that I've stated here before is that no one can go far enough right to get the nomination and then get back to the middle to get the moderates to vote for you.
I'd love to see the left get out of the full on welfare but still do things like the ACA, or RomneyCare as I like to call it.