President Barack Obama says he wants to buy a Chevy Volt when he’s out of office in five years. If getting into a General Motors electric automobile means so much to him, he’d better hope he loses in November. What the president dubbed the “car of the future” in a visit to a Volt plant may not make it to January 2017. The partially government-owned General Motors has suspended production of its government-approved miracle car and temporarily laid off 1,300 workers at a Detroit plant. The halt is the result of a piddling detail lost in the gushers of praise...