"It's a serious clusterf*ck": Behind-the-scenes fury and panic roil key House primary

While Democrats across the country are pulling their hair out over Michigan's brutal Democratic Senate primary, a key House race in the state is also quietly giving party leaders heartburn. Why it matters: Infighting between establishment Democrats could create an opening for a progressive who many Democratic strategists and lawmakers are skeptical can win the seat in November. Moderate Democrats and party leaders' inability to coalesce behind a single candidate has become the source of…