‘Stop Sanders’ Democrats Are Agonizing Over His Momentum

When Leah Daughtry, a former Democratic Party official, addressed a closed-door gathering of about 100 wealthy liberal donors in San Francisco last month, all it took was a review of the 2020 primary rules to throw a scare in them.

Democrats are likely to go into their convention next summer without having settled on a presidential nominee, said Ms. Daughtry, who ran her party’s conventions in 2008 and 2016, the last two times the nomination was contested. And Senator Bernie Sanders of Vermont is well positioned to be one of the last candidates standing, she noted.

“I think I freaked them out,” Ms. Daughtry recalled with a chuckle, an assessment that was confirmed by three other attendees. They are hardly alone.

How, some Democrats are beginning to ask, do they thwart a 70-something candidate from outside the party structure who is immune to intimidation or incentive and wields support from an unwavering base, without simply reinforcing his “the establishment is out to get me”’ message — the same grievance Mr. Trump used to great effect?

But stopping Mr. Sanders, or at least preventing a contentious convention, could prove difficult for Democrats.

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