Speakers for Vice President Kamala Harris’s presidential campaign seemed to struggle to find a cohesive message this week as supporters urged “solidarity” amid calls for a more progressive platform.Maurice Mitchell, national director for the Working Families Party, hosted the “Progressives for Harris” video call on Monday – calling on his “comrades” to find “solidarity” in the fight against “Trumpism” and “American authoritarianism.” “This, my friends, my comrades – as we say in sports – is our political fourth quarter,” said Mitchell, struggling with glitched-out sound and occasionally dropping audio. “And one day our descendants will look back on this chapter in history and ask us what we did to stop the forces of fascism and American authoritarianism.“KAMALA HARRIS HOLDING RALLY IN PENNSYLVANIA TO INTRODUCE RUNNING MATE AFTER SECURING DEMOCRATIC NOMINATIONMitchell te …