I wrote up a piece for CNN.com that just posted on the site. The first three paragraphs:

Many observers may scratch their heads wondering how a crass billionaire can make inroads with working-class voters, but their confusion misses a critical point: The political revolt that benefited Donald Trump is not limited to the Republican Party, but is also in full fury inside the Democratic Party. Democrats, by embracing in the 1990s a series of bipartisan policies geared toward corporations at the expense of American jobs, have since failed to adequately defend America’s working class, and those voters are making their presence felt at the ballot box as a result.

Recent polls show the frustrations they feel toward the Democrats pose a real danger in the race for the White House, depending on who ends up winning the nomination. Quinnipiac found a battle between Hillary Clinton and Donald Trump to be an essential tossup in three key swing states: Ohio, Pennsylvania and Florida. Meanwhile, in West Virginia, 53% of Democratic voters said global trade deals take jobs away from American workers.

Establishment Democrats are trying to wave off a recurring theme in poll after poll, including the Quinnipiac numbers and Tuesday night’s primary results: Bernie Sanders is a much stronger general election candidate versus Trump. A Reuters/Ipsos poll released Wednesday even showed Donald Trump and Hillary Clinton running nearly neck-and-neck nationally.