"Like father of the conservative movement Barry Goldwater, Sanders is a factional candidate of the true faith, the representative of those who believe his party has lost touch with its ideological moorings. His brand is consistency and sincerity, which wins him affection if not support even from some opponents. But those very same qualities make it easy for the opposition (both within and outside the party) to tar him as a radical and an extremist. Sen. Goldwater lost the 1964 presidential election badly — but he was running against Lyndon Johnson, a legislative titan whose approval rating was over 75 percent that February. And Goldwater transformed his party nonetheless. His opposition to the 1964 Civil Rights Act began the process of ideological realignment that turned the South solidly Republican, a key factor powering Ronald Reagan's victorious quest for the presidency in 1980 and Newt Gingrich's capture of the House of Representatives in 1994. How did Goldwater's thrashing ultimately lead to a Republican majority? The answer is both ideological and demographic. Goldwater realigned the Republican center toward the South and West, the fastest-growing regions of the country. Increasing dominance in these regions led to a substantial electoral college advantage that wasn't broken until 1992. Ideologically, meanwhile, he gave Republicans something to be for rather than merely against. That's why they were able to define a new political era when Reagan won. That's the promise that Sanders holds even if he loses: that he opens the door not only to a return to power, but a transformation of the terms of the debate, something neither Clinton nor Obama — nor Eisenhower, Nixon, or Bush — achieved, but that FDR, Johnson, and Reagan did. But what's the demographic basis of Sanders' rise? And could it actually point to a dominant coalition, whether it manifests in 2020 or a subsequent election?"