Since the holiday is approaching, MLK would applaud those positions. Although many well-meaning people don't see it, I see a pattern where we'll celebrate him without celebrating his ideas. MLK was likely a Democratic socialist as he railed against capitalism, he wasn't afraid to talk about poor white people (the system is rigged against them, too), he talked about poor people outside of race, he talked about a universal basic income, and talked about a "radical redistribution" of economic power because one who has no income simply exists. It's more than, "Be nice to black people and make sure they have voting rights." The economy was a huge part of his vision and the vision of civil rights leaders who were inspired by him.
Sanders' positions most closely align with this, but Democrats fall into this thing where there's little vision for the country, plus don't look at people's voting records. I can define what a Republican is; I can't define what a Democrat is because they've been running away from their own shadow and have done little to stem voodoo economics since the 80s. It's embarrassing that the Democratic front-runner doesn't straight-up believe in marijuana legalization and ending the War on Drugs, which have hurt poor people in general and disproportionately hurt minorities. But despite implementing and fighting for policies that have caused this (not simply a bad vote or a vote for a package with good things and bad things, but a prolonged record of this), nobody will look at him or the legions of "centrist" Democrats who helped create this. They'll look at this video instead despite the policies being superior to most, if not all, Democrats' positions in lifting up the poor.