All in one day, Joe Biden embraces and runs afoul of labor.

A labor conflict was developing in Washington as the president delighted in his pro-worker message and working-class heritage during a speech in Michigan. And Biden was not the labor hero this time.

Joe Biden, the Labor Guy, was in his own Tuesday, speaking to union employees at a semiconductor company in union-friendly Michigan, mourning the loss of coal and steel sector employment when he was younger and promising to support workin....