David Frum predicts if Sanders is selected he'll lose

Bernie Sanders is a fragile candidate. He has never fought a race where he had to face serious personal scrutiny...Sanders had benefited from “an unwritten compact between Sanders, his supporters, and local reporters who have steered clear” of writing about Sanders’s personal history “rather than risk lectures about the twisted priorities of the press.”

The Trump campaign will not steer clear. They will hit him with everything they’ve got. They will depict him as a communist in the grip of twisted sexual fantasies, a useless career politician who oversaw a culture of sexual harassment in his 2016 campaign. Through 2019, Donald Trump and his proxies hailed Sanders as a true voice of the people, thwarted by the evil machinations of the Hillary Clinton machine. They will not pause a minute before pivoting in 2020 to attack him as a seething stew of toxic masculinity whose vicious online followers martyred the Democratic Party’s first female presidential nominee.

The Sanders campaign is a bet that the 2020 campaign can be won by mobilizing the Americans least committed to the political process while alienating and even offending the Americans most committed to it. It’s a hell of a gamble, and for what? To elect to the presidency a person with a proven record of accomplishing little for the causes he espouses, despite almost 32 years in the House and Senate?