Well it is an easy hit, after all Jonah Goldberg just wrote a whole tome that was just comparing the Good and greatwith Hitler and more especially Mussolini, just dig up a random chapter there and it will take you five minutes to to note the simlarities between Hillary and Mitchell Palmer or even George Bush and the more creepy aspects of Woodrow Wilson.
It is an easy arument you take sxomeone who is branded "EVIL" and then you look and find out wht ws so objectionable. Say Hitler liked nature and was a (sort of) vegetarian, then you note how Bill Cinton founded so many Parks, see they are just the same. Same goes with Obama and McCain is almost a magic target for this sort of thing.
Anyone with any sweeping vaguely progressive agenda is going to turn p rhetorical similarites to political pariahs. After all Huey Long built Louisiana's magnificent freeways before the war, the model of the Intersate Highway System. See this just proves IKE and the Kingfish were one and the same.
Savonarola wanted to get money out of politics, John McCain wants to do the same, so if McCain is nominated we'll be burning the National Gallery in a bonfire n the mall and burning atheists at the stake.