How to strike just the right balance as a debate moderator

In this composite image, Republican presidential nominee Donald Trump (L) and Democratic presidential nominee Hillary Clinton respond to questions during the town hall debate at Washington University on Sunday, Oct. 9, 2016 in St. Louis, Missouri.

How do you keep candidates on time and on topic? When do you interject and when do you stay quiet? It's hard out there for a moderator.

Chris Wallace, host of Fox News Sunday, will be moderating tonight's presidential debate.

If the previous two debates are any indication, Wallace's job this evening will not be an easy one.

The public harshly rebuked Lester Holt, who moderated the first debate, for not getting involved enough. Then critics lashed out at both Martha Raddatz and Anderson Cooper for interjecting too often in round two.

It's hard out there for a moderator.

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, Sacramento bureau chief for the Los Angeles Times and moderator for the 2010 and 2014 gubernatorial debates here in California, joined Take Two for a conversation about the role of the debate moderator.

To hear the full interview, click the blue player above.