Razor-tight races could leave House control in limbo for weeks

It could be days — or even weeks — before Americans know who will control the House of Representatives in the next Congress, setting up what could be a long and anxious window of uncertainty surrounding the balance of power on Capitol Hill next year.

There are dozens of closely contested seats up for grabs, setting the stage for a potential scenario where many of those contests are too close to call on election night and the race to 218 remains unresolved.

Determining the ultimate...