You can read the story of Rich Iott here. He's the Republican nominee running in Ohio's 9th District.
Of course, dressing up like a Nazi doesn't make you a Nazi. Still, this description taken from the webpage of Iott's group is striking:
Germany headed a stong movement in Europe to actively campaign (politically and through warfare) against the ideals of Bolshevist Communism. This culminated in 1941, when the German armed forces were pitted against the very home of Bolshevism, Soviet Russia. Nazi Germany had no problem in recruiting the multitudes of volunteers willing to lay down their lives to ensure a "New and Free Europe", free of the threat of Communism. National Socialism was seen by many in Holland, Denmark, Norway, Finland, and other eastern European and Balkan countries as the protector of personal freedom and their very way of life, despite the true underlying totalitarian (and quite twisted, in most cases) nature of the movement. Regardless, thousands upon thousands of valiant men died defending their respective countries in the name of a better tomorrow. We salute these idealists; no matter how unsavory the Nazi government was, the front-line soldiers of the Waffen-SS (in particular the foreign volunteers) gave their lives for their loved ones and a basic desire to be free.
Iott is no longer one of the "young guns" for the Republican Party (here). The tent is still big enough for him, it's just that the webpage shrank.
So, just so we're fair to the GOP. Being the sort of person that dresses up like a Nazi for a little fun on the weekends to "salute" those Nazi "idealists" won't disqualify you from being a "young gun" for the Republican party, but being known as being the sort of person that thinks its cool to salute the Nazi idealists will. I'm glad that there are some standards in force.