Issa's vote on the AHCA still perplexes me. He's arguably the most vulnerable Clinton-district Republican and he still goes on to vote in favor of the bill.
That's the old
delegate versus
trustee argument. Do you elect someone to a legislature because you are
delegating to them the responsibility to vote on legislation the way you yourself would, or are you electing someone because you
trust that said person will exercise sound judgment, and will explain to you why they sometimes disagree with you?
As was famously said by Edmund Burke, a representative's responsibility to his constituents is "judgment," not "industry." Burke believed that a representative should be a trustee, not a delegate. When a representative disagrees with their own constituents, he owes it to them to vote his conscience, and explain to the constituents why HE is right and they are wrong. It's politically risky, but some voters DO respect it when their representative takes a risk like that.
Issa is very vulnerable, though. I doubt he'll win again, no matter how his constituents react to his AHCA vote and his efforts to explain why he voted that way.