Democratic Rep. John Conyers of Michigan could be left off his district’s upcoming primary after failing to gather enough signatures. The Wayne County elections clerk, Cathy Garrett, says Conyers is more than 400 valid signatures shy of the 1,000 needed to get on the August ballot. Garrett says Conyers’ petition falls short because he did not collect enough signatures from registered voters. The American Civil Liberties Union has filed a lawsuit challenging that requirement. If the ruling stands, Conyers could run as a write-in candidate. First elected in 1964, Conyers is the House’s second-longest-serving incumbent.