Democrats need a better answer to the Mitch McConnell question

The debate Democrats need to have: How do you win back the Senate?

The question that mattered most at the Democrats’ first presidential primary debate was the question that none of the assembled candidates had a good answer for: What will you do about Mitch McConnell?

The Democrats onstage in Miami Wednesday night had plans for everything. It was a festival of policy proposals on immigration and gun control, health care and climate change. But even if one of those candidates wins in 2020, if McConnell remains Senate majority leader,...