One of the indisputable facts of the Democratic primary is that only one candidate has made personal smears the centerpiece of their campaign strategy. That candidate is Bernie Sanders.

His Wall Street dog whistle is a barely concealed attempt to accuse Hillary Clinton of corruption, despite the fact that he lacks a scintilla of evidence to support that claim. We’ve argued that no matter how lofty and inspiring Bernie’s message, it is deeply unjust – and frankly, reckless – to run a campaign premised on the destruction of Hillary’s character through false innuendo.

And make no mistake, Bernie’s campaign message and the behavior of his supporters have become less about something and more against someone. His path to victory runs right through Hillary’s integrity.

Tad Devine, Jeff Weaver, Cornel West, Killer Mike, and other Bernie aides and surrogates have led the charge against Hillary’s character, calling her honesty into question with no justification or evidence.

Bernie’s online trolls have bullied and intimidated Hillary’s supporters, spewing sexist tropes and slandering Hillary with demeaning rightwing talking points.

Meanwhile, Donald Trump marches to the GOP nomination, leading a dangerous and intolerant movement.

Nothing is certain in politics, but it’s safe to say that Hillary has a greater than 50% chance of winning the Democratic nomination. Unless Bernie doesn’t care about putting a Democrat in the White House this November, he should immediately stop the unfair, unjust, and unsubstantiated character smears against Hillary.

He should call on his surrogates and supporters to focus exclusively on issues and to let go of the desperate “release the transcripts” hit, which only further helps Republicans assail Hillary’s integrity.

This is a deadly serious time and a gravely important election. It is the height of irresponsibility for Bernie to allow the savaging of Hillary to continue.