The drug of power, which Kissinger called the best aphrodisiac, is probably more than sufficient for them.
And the fact that 40% of Americans are happy to characterize themselves as liberal or somewhat liberal makes me think that the sick, twisted politicians you mention are right in step with a big slice of our population.
I thought the breakdown was more on the order of 40% conservative, 36% moderate and 24% liberal on a recent poll.