What does an Ohio special election say about the November midterm elections?

In an Ohio congressional district that has sent Republicans to Washington for decades, the special election race on Tuesday is currently too close to call, with Republican Troy Balderson leading Democrat Danny O’Connor by less than one percentage point. What does it mean for chances of a November blue or red wave? Did President Trump’s weekend rally there help Balderson? What about suburban GOP women? What about turnout? Will Democrats re-think Nancy Pelosi as speaker, and will that to help their chances?

More questions, as the two Ohio candidates will meet again in November.