Sen. Bernie Sanders Bernie SandersButtigieg stands in as Pence for Harris's debate practice Bernie Sanders warns of 'nightmare scenario' if Trump refuses election results Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE is making a plea for voters to head to the polls to prevent a Donald Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE presidency.

"If you sit this election out and Trump wins by a few votes," the Vermont senator tweeted Saturday, "many people are going to be dealing with that reality for their entire lives."

If you sit this election out and Trump wins by a few votes, many people are going to be dealing with that reality for their entire lives. — Bernie Sanders (@BernieSanders) November 6, 2016

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The Vermont senator has been campaigning for Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE in recent months in an attempt to rally voters behind the Democratic nominee's campaign.

The race has been tightening in recent days with the election just days away.

According to the RealClearPolitics average of polls, Clinton has a 2.2-point lead over her Republican rival, 44.9 to 42.7 percent.

FiveThirtyEight's polls-plus forecast predicts Clinton has a 64.8 percent chance of winning the White House.

The major party nominees are making their final pitches to voters, urging their supporters to get out and vote.