Bobby “Al Jolson” Berger in a screenshot from a performed in blackface as Al Jolson, the 1920s vaudeville star. His last performance was in 2015, but now Berger is calling on that past to run for the House of Delegates.By Talia Macchi For decades, Bobby “Al Jolson” Berger performed in blackface as Al Jolson, the 1920s vaudeville star. Now, Berger is running for Maryland’s House of Delegates — not in blackface but officially as Bobby Al Jolson Be…