Obama's lawyers won't have to file anything-- the clerk of the court will bounce it on its own.
Private citizens can't file criminal charges; only prosecutors can. And treason being a federal crime, no one can file a charge of treason in state court.
Well, then, it must be filed in Federal Court.
If 100,000 conservatives contributed $10 a month (even I could afford that!) the finest legal minds in the country could be hired to prosecute...
Yes, that is a challenge.