This is not random. Here is Bernie in April of 2017 reiterating his argument that Trump voters are not motivated by racism, but that there concerns about Mexican and Chinese imports, immigrants from Mexico, refugees from the Middle East, Muslim extremists, is not motivated by xenophobia or racism, but by legitimate concerns. This is why you will here Bernie echo Trumps positions on occasion in more race neutral and progressive sounding verbiage. For example, Bernie is against immigration to prevent the exploitation of immigrants and their children.
Bottom line: Bernies part to the 2020 nomination is clear as he projects himself as a candidate who supports Democratic economic policies while being sensitive to the fears and sensitivities of Trump supporters.
https://www.newsweek.com/bernie-sanders-trump-voters-clinton-racist-deplorable-578290
Donald Trump supporters are not racist deplorables and Hillary Clinton and the Democratic Party are to blame for Novembers shock election defeat: So said Clintons defeated primary challenger Sen. Bernie Sanders during a rally in Boston Friday night.
In a comment seized upon by the Trump campaign, Clinton famously said in September that half of Trumps supporters were deplorables, a comment which she almost immediately said she regretted.
Appearing alongside Sen. Elizabeth Warren, Sanders said Friday that to simply write off Trump supporters was to fail to understand the issues affecting themand the Democratic Party.
Some people think the people who voted for Trump are racists, sexist and homophobes, just deplorable folks, he said. I dont agree, because Ive been there. Let us understand whats going on.