HBO talk show host Bill Maher criticized former President Barack Obama and Democratic Gov. Tim Walz of Minnesota Friday night over their outreach to black voters. Obama spoke at a Pittsburgh-area campaign office for the vice president Thursday, where he urged black men to support Vice President Kamala Harris, while appearing to accuse them of sexism for being hesitant to back the Democratic nominee. Maher said efforts by Walz and Obama to boost black turnout was “not a good sign” for Democrats. READ: Dem Strategist Torpedoes Obama Over His Message To Black Men “It’s 25 days before the election…