Yes, he
was elected! He was elected by lying to his constituents (to his party, too, but they were well aware what he was up to and approved), he managed to make them elect him. They gave
him the power to make decisions on
their behalf.
Why is it so difficult for you to understand this principle?! The voters gave him the right, and now he doesn't have to concern himself with their wishes or needs for the next couple of years and he is (more or less) free to sell his decision-making powers to the highest bidder. That's
representative democracy!
His own
conscience and
"Providence, for the abuse of which he is deeply answerable," are all that matters. He just has to convince
them, not people who voted for him, that he is doing the right thing, and we all know how easy it is to convince those entities ...