No Democrat who won the Iowa caucus has ever went on to become President.
Some Democrats also believe the caucus electorate is too left-leaning for the party’s good. As one strategist put it, “The only time Democrats have nominated a candidate who won the White House since 1976 was the year everyone skipped Iowa.” That was in 1992, when all other candidates deferred to home-state Sen. Tom Harkin’s presidential bid. Harkin won Iowa handily, and Clinton went on to become the party’s nominee and president.
Though Carter did finish first among candidates in 1976, though he finished a whooping 9% behind “Uncommitted”