By comparing Republican candidates to Hitler, they reduce the significance of Adolf's crimes.
A 96 year old Holocaust survivor criticized Democrats and their media allies for comparing Republican presidential candidates to Hitler. They belittle the crimes of the Austrian madman by saying Mitt Romney is Hitler.
There are enough bad things Republicans do that you don't have to go off the deep end and look crazy comparing them to him.
Thomas Sowell: There are no solutions, just trade-offs.