Bernie SandersBernard (Bernie) SandersMellman: On Political Authenticity (Part 2) Former Sanders campaign manager: Don't expect email list to be shared with DNC Adult film star: Trump and Stormy Daniels invited me to 'hang out' MORE got his biggest cheer of Sunday night’s presidential debate in Flint, Mich., when he suggested the Republican debates were the result of rampant mental health problems.

“We are, if elected president, going to invest a lot of money into mental health,” Sanders told the Democratic debate audience. 

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“And when you watch these Republican debates, you know why we need to invest in mental health.”

The audience cheered loudly at the line, and Sanders’s rival on stage, Hillary ClintonHillary Diane Rodham ClintonIntel Dem decries White House 'gag order' after Bannon testimony 'Total free-for-all' as Bannon clashes with Intel members Mellman: On Political Authenticity (Part 2) MORE, laughed loudly.

Clinton gave Sanders the opening for his zinger when she said, “We have our differences, and we get into vigorous debate about issues. But compare the substance of this debate with what you saw on the Republican stage last week.”

Thursday night’s GOP debates included a lot of name-calling and a moment in which front-runner Donald TrumpDonald John TrumpDems flip Wisconsin state Senate seat Sessions: 'We should be like Canada' in how we take in immigrants GOP rep: 'Sheet metal and garbage' everywhere in Haiti MORE defended the size of his hands.