I actually endorse mixed martial arts as a form of political discourse. How much more exciting would politics be if, instead of throwing incendiary rhetoric at each other, politicians threw roundhouse kicks instead? There's the way to really get young voters involved!
In all seriousness, though, this guy, his name is Jacob Volkmann, is in for all kinds of hate now. Everybody knows he isn't seriously threatening the president and is merely expressing his disdain for policies that will negatively impact his, and everyone's, life. That's politics for you.