Moderate Democrats are celebrating MLK. He was disgusted by them

This Martin Luther King Jr. Day comes as moderate Democrats, falling in line behind former vice president Joe Biden, are warning that the party risks re-electing Donald Trump if it nominates too radical a candidate for president — by which they mean someone like Senators Bernie Sanders or Elizabeth Warren.

This so-called moderate world view is underpinned by the belief that, over the arc of this nation's history, we have been striving for and realizing a "more perfect union" through disciplined incrementalism and market capitalism.

Some pundits extol this as...