Former Democratic presidential candidate Bernie SandersBernard (Bernie) SandersHannity snaps back at 'Crybaby' Todd: 'Only conservatives have to disclose relationships?' Chuck Todd lashes out at Fox, defends wife in radio interview Trump pressed Sessions to fire FBI agents who sent anti-Trump texts: report 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 ClintonPaltry wage gains, rising deficits two key tax reform concerns Trump pressed Sessions to fire FBI agents who sent anti-Trump texts: report DNC sues Russia, Trump campaign and WikiLeaks over alleged election interference MORE over Republican nominee Donald TrumpDonald John TrumpIG investigating Comey memos over classified information: report Overnight Defense: Congress poised for busy week on nominations, defense bill | Trump to deliver Naval Academy commencement speech | Trump administration appeals decision to block suspected combatant's transfer Top Pruitt aid requested backdate to resignation letter: report MORE

Libertarian presidential nominee Gary JohnsonGary Earl JohnsonWithout ranked voting, Pennsylvania's slim margins hide voters' preferences If weed is no longer a crime, why are people still behind bars? Gary Johnson: Trump admin marijuana policy shift could cost him reelection 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.