Yes, late-breaking and undecided voters do exist — and matter

In today’s highly polarized political times, you might think that undecided, late-breaking voters are an extinct species — akin to the passenger pigeon and the Dodo bird.

But ahead of this November’s gubernatorial races in Kentucky, Louisiana and Mississippi, the Democratic Governors Association believes they certainly exist. And the organization has built a polling model to measure how these late-moving voters might break on Election Day, as well as to determine how to target these voters and spend its final resources. CONT.

Mark Murray, NBC News