President Joe Biden and former President Donald Trump both won their parties’ Michigan primary, but neither had nights that were triumphant. The question now becomes: who has the bigger warning sign and how will he deal with it? Politico: President Joe Biden and former President Donald Trump scored decisive wins in their respective Michigan primaries on Tuesday, with questions hovering over both. Trump continues to face a faction of Republicans who refuse to back his candidacy despite his chokehold on the nomination. Biden was confronted with a protest movement urging Democrats to vote “uncomm…