Our party “seems all too anxious to snatch defeat from the jaws of victory, and we will do the same if we nominate” an extremist for our presidential candidate. Moderates “represent the most electable area of the party.” This is not a contemporary pundit or some Democratic Party operative warning about the potential nomination of avowed Democratic Socialist Bernie Sanders Bernie SandersNYT editorial board remembers Ginsburg: She 'will forever have two legacies' Two GOP governors urge Republicans to hold off on Supreme Court nominee Sanders knocks McConnell: He's going against Ginsburg's 'dying wishes' MORE. It was the moderate Republican Representative John Anderson warning about the nomination of Ronald Reagan in 1980.

An internal memo by strategists for Democratic President Jimmy Carter showed they welcomed a Reagan candidacy, believing that they could defeat him with a negative campaign of moderates versus right wingers. Reagan won the Republican nomination and then completely thrashed Carter by 10 points in the popular vote and 440 electoral votes.

Reagan then, like Sanders now, had long experience in deflecting attacks on his alleged extremism. The real problem for the Carter campaign was the lack of a compelling theme for his reelection. An internal memo had a very conspicuous blank in the space reserved for “general encompassing theme.” Whatever you may think of Sanders, among all the Democratic candidates, he has the boldest overarching theme for his campaign.

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The pundits and leaders in the Democratic establishment today deeming Sanders unelectable declared the same in 2016 about Donald Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE who would ban Muslims from entering America, build a wall along the southern border, start a trade war with China, and backtrack on fighting climate change. On election night, the pundits twisted themselves into pretzels trying to explain why what they said could not happen actually did.

The truth is that issues and ideology have no real value in predicting the outcome of a presidential election. For decades, Democrats thought they had solved the electability puzzle by regularly nominating moderate and experienced candidates such as Michael Dukakis in 1988, Al Gore in 2000, John Kerry in 2004, and Hillary Clinton in 2016. But what these candidates have in common is that they would all lose to the Republican nominee.

Only unconventional “off the wall” Democrats have won the presidency in the last five decades. Jimmy Carter, Bill Clinton, and Barack Obama were unknown figures outside the party establishment. All had been considered unelectable at one time by pundits and party operatives. Republicans also fared no better with the moderate presidential candidates in recent years. John McCain in 2008 and Mitt Romney in 2012 lost to Obama. Republicans only regained the presidency with the unconventional Trump in 2016.

There is more than history as well. Current polling shatters the myth that a moderate candidate is more electable than Sanders. His opponents claim that he could not beat Trump in critical swing states and would also hurt Democratic candidates for Congress. Yet recent polling from four swing states conducted by Quinnipiac University and the University of North Florida show Sanders beating Trump in Michigan and Pennsylvania, tied with Trump in Florida, and losing to the president only in Wisconsin.

Joe Biden, the moderate favorite, polls no better than Sanders. He also wins Michigan and Pennsylvania against Trump, leads by 1 point in Florida, and loses to Trump in Wisconsin. Two other moderate candidates, Amy Klobuchar and Pete Buttigieg, beat Trump in Michigan and Pennsylvania, but they lose to him in both Florida and Wisconsin in the same polls.

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Nationwide polls tell a similar story about the electability of Sanders in the general election. A Washington Post poll shows Sanders beating Trump by 6 points, compared to a lead of 7 points over Trump for Biden. Klobuchar and Buttigieg lead Trump by only 2 points and 3 points respectively. Even in red leaning Texas, the latest Texas Tribune poll shows Sanders trailing Trump by just 2 points. The lead that Trump holds over Biden there is a larger 4 points. Both Klobuchar and Buttigieg trail Trump by 5 points.

I cite these early polls not to predict results in the general election this fall, but only to show that they provide no evidence that Sanders is less electable than the moderate Democratic alternatives. I have not included Michael Bloomberg in this analysis because polling on his candidacy is still premature, given his disastrous debut in the debate last week.

I am not advocating here for the nomination of Sanders. However, my advice to Democrats is to stop chasing the will of the wisp of electability. Conventional assessments of who can and cannot beat Trump will only lead them astray. Instead, Democrats must follow their conscience and vote for the candidate they believe in. That is never a wrong decision.

Allan Lichtman is an election forecaster and distinguished professor of history at American University. He is the author of the forthcoming book “Repeal the Second Amendment” and is on Twitter at @AllanLichtman.