EDITORS:

The last special election of the year for the U.S. House is too close to call.

With election officials in Ohio done counting Tuesday night, Republican Troy Balderson has a slight lead over Democrat Danny O'Connor in the special election in the state's 12th Congressional District.

But there are at least 3,367 provisional ballots left to be reviewed. That's enough for O'Connor to potentially pick up enough votes to force a mandatory recount. Under Ohio law, the threshold in a congressional race for a mandatory recount is 0.5 percentage points.

The Associated Press does not declare winners in races that go to an automatic recount.

The AP