Alex Trebek did his homework before moderating the only debate to be held in the Pennsylvania governor's race.

But that was only part of the problem.

Twitter users jeered Trebek, the host of "Jeopardy!," for showing how much he knew about the state.

But there was a bigger issue at hand: In Monday's debate between two candidates vying for Pennsylvania's top job, too much time was spent on the moderator.

The debate was the only time Pennsylvania voter's got to see the two candidates for governor debate the issues. The Pennsylvania governor's race usually includes at least three debates. That's been a precedent, but not a rule, since 1990.

This year, Gov. Tom Wolf, a Democrat who is ahead by 22 points in the latest Franklin & Marshall College poll, agreed to only one debate. His challenger, Republican Scott Wagner, wanted to debate in each of Pennsylvania's 67 counties.

Trebek pointed out that debating in 67 counties was an unrealistic goal, but Wagner disagreed.

That exchange drew ire toward Trebek..

More:Pa. governor's race 2018: Wolf, Wagner face off in only debate

Trebek also used up some of time to riff on the Catholic Church for more than a minute.

Trebek said he grew up Catholic and that predatory behavior is everywhere – not just the Catholic Church. He said it's found in government, sports and show business, too.

That brief lecture was one the audience could've lived without, with many people shaking their heads "no" as he talked.

When the debate ended, Trebek was booed.

Ryan Tarkowski, the communications director for the Pennsylvania State Police, said, "Hearing A LOT of Alex Trebek tonight. Not sure I've ever heard a debate moderator talk so much."

His tweet and others are below: