Let me see if I have this straight.
From 1968 - 1988 Dems ran arch liberals for Prez. They won exactly one election, which is when a more moderate candidate (Carter) triumphed. They lost 5. They also got absolutely crushed in 3 of those elections (1972, 1984, 1988) with very liberal nominees.
From 1992 - 2016, Dems have won 4 out of 7 times. They had a Dem serve two full terms for the first time since FDR (Clinton). They had a Prez win 51% of the vote in both elections for the first time since Eisenhower. They've won the popular vote in 6 of those 7 contests and the other loss (2004) was relatively narrow.
BUT, based on the Bernie caucus, who apparently knows more about winning elections that Barack Obama (I mean, I'm an arrogant guy, but geesh that's even a leap for me!) we should go BACK to nominating the people who lost every election where they were the nominee? Huh.