Former Democratic presidential candidate Bernie SandersBernie SandersNewsmax host: Jury decided to 'sacrifice' Chauvin to the mob Lawmakers react to guilty verdict in Chauvin murder trial: 'Our work is far from done' Senate confirms SEC chief Gensler to full five-year term MORE on Sunday discouraged voters from picking a third-party nominee, saying the issues facing the U.S. are too dire for a "protest vote." 

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"This moment in history for a presidential election is not the time for a protest vote," the Vermont senator said on CBS's "Face the Nation." 

"It's time to look at which candidate will work best for the middle class and working families." 

He said he didn't want to disparage third-party candidates, but he encouraged voters to pick Democratic presidential nominee Hillary ClintonHillary Diane Rodham ClintonPelosi on power in DC: 'You have to seize it' Cuba readies for life without Castro Chelsea Clinton: Pics of Trump getting vaccinated would help him 'claim credit' MORE over Republican nominee Donald TrumpDonald TrumpSt. Louis lawyer who pointed gun at Black Lives Matter protesters considering Senate run Chauvin found guilty as nation exhales US says Iran negotiations are 'positive' MORE

Libertarian presidential nominee Gary JohnsonGary Earl JohnsonNew Mexico lawmakers send recreational marijuana bills to governor Judge throws out murder convictions, releases men jailed for 24 years On The Trail: Making sense of Super Poll Sunday MORE has hoped to benefit from record low favorability numbers for Clinton and Trump. But a RealClearPolitics polling average only gives him 8.9 percent support nationally.