CLEVELAND -- What kind of problems can occur at polling places on Election Day, especially in such a close and charged race?

NewsChannel5 chief investigator Duane Pohlman went with undercover cameras into some polling places throughout northeast Ohio to take a look at how the voting process went.

Pohlman reported that in most cases it was orderly and civil.

But at St. Martin de Porres, a predominantly African-American polling place on Cleveland's east side, there was trouble.

A ballot box was knocked over and the seal was broken, and there were allegations of voter intimidation inside.

An elections inspector was called in to sort it out.

Problems also surfaced in Shaker Heights, reported Pohlman.

In Cleveland, not enough polling machines caused long waits for voters.

One voter said that with lines three hours long, many didn't wait.

One voter said at least 10 African-American voters gave up and walked away.

In East Cleveland, Pohlman said they watched as three men in suits walked in, who were not supposed to be there.

The Board of Elections inspector said the men wouldn't give him their names.

Polhman said he asked them, but they would not give him an answer.

Outside, a voter said the men were Republican challengers. If they were, Pohlman said there were too many of them in the polling place, at least three.

Pohlman reported that they drove away in a car with Minnesota plates.

If the outcome of this election is challenged, the problems that occur on Election Day will likely be a focus for those contesting it.