Last night, Vermont Senator Bernie Sanders, one of the remaining candidates for the Democratic presidential nominee, held a rally in Phoenix, Arizona. During the rally, one man unfurled a Nazi flag in the background and began shouting anti-Jewish slurs. The symbolism of waving a Nazi flag at the rally of a potential presidential candidate is one thing, but knowing that Sanders is also a Jewish American takes it to the next level.

Several members of Sanders' family on his father's side were killed during the Holocaust. Sanders is also the only Jewish candidate in the field and his two presidential campaigns are the most successful runs headed by a Jewish American ever.

Yet even as anti-Semitism and racism are in full swing within this election cycle, that fact does not get as much publicity as the actions of " Bernie Bros," die-hard Sanders supporters who engage in acts like online bullying in the name of the candidate they support.

Sanders has been criticized for the actions of his more radical supporters many times. Mike Bloomberg and Elizabeth Warren have called out the actions of his supporters asking Sanders to condemn their actions — sometimes making it sound as though Sanders is the one condoning those actions in the first place. Or, that if he doesn't condemn them, he is in turn condoning them.

What is clear is that supporters of any candidate work outside of the authority of that candidate. As we can see with a man hanging a Nazi flag at the rally of a Jewish candidate who has family who were killed in the holocaust. Whoever that man supports (if anybody) is not responsible for one supporter's actions.

There is a fine line between blaming someone for the actions of others and condoning those actions. And this line seems to be even finer when it comes to Bernie Sanders.