Godwin's law comes from Internet discussion/argument groups. The first person to invoke Hitler's name (usually by calling his opponent a Nazi) lost the argument. That rule used to be confined to high level Internet surfer nerds.
Well, Godwin's law is spreading. Hillary Clinton compared Putin's claim to be protecting Russians in Crimea to Hitler's claim to be protecting Sudetenland Germans in the 1930's. Which actually is a pretty good fit. Hitler took over Czechoslovakia claiming he was protecting ethnic Germans living in Czechoslovakia. Putin took over the Crimea claiming that he was protecting ethnic Russians living in the Crimea. What goes around comes around.
And, Hillary was forced to back off about comparing Putin to Hitler. Apparently the liberal newsies just couldn't stomach calling a bastard a bastard. Godwin's law moves off the 'net into the political world.