First off, Hitler, Mao, and Stalin did not have remarkably similar approaches to central government other than the fact that they were all totalitarian. Even Stalin and Mao had vastly different approaches to government.
Liberals tend to be for more personal freedom but less economic freedom. Conservatives tend to be for more economic freedom but less personal freedom. If you go to politicalcompass.org, you can see where different historical figures fit ideologically as well as the 2016 candidates.
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Those of course are compared to political parties and leaders around the world. Which is why we rank pretty far the right because we are more conservative than most parties and that would include Democrats. I mean for crying out loud, if Democrats are commies then what are Canadians, all Western Europeans, the Japanese and Australians? Of those have governments that are well to the left of ours.