Wealthy MAGA donors are funneling millions of dollars to the campaign of a Democrat who’s running against former U.S. Capitol Police Officer Harry Dunn, a report revealed Saturday. Dunn, who was beaten by rioters on Jan. 6, 2017, is outspoken about the insurrection, giving testimony on Capitol Hill and regularly appearing on MSNBC. He’s running against state Sen. Sarah Elfreth, among others, for the Democratic nomination to represent Maryland’s third district in Congress. The state’s primary is on Tuesday. But his opponent has received a multi-million dollar flood of donations from a surprisin…