Clinton Might Not Be the Nominee, by Douglas Schoen.

A Sanders win in California would turbocharge the mounting Democratic unease about her viability.

There is now more than a theoretical chance that Hillary Clinton may not be the Democratic nominee for president. …

A Sanders win in California would powerfully underscore Mrs. Clinton’s weakness as a candidate in the general election. Democratic superdelegates—chosen by the party establishment and overwhelmingly backing Mrs. Clinton, 543-44—would seriously question whether they should continue to stand behind her candidacy. …

Finally, with Mrs. Clinton’s negative rating nearly as high as Donald Trump’s, and with voters not trusting her by a ratio of 4 to 1, Democrats face an unnerving possibility. Only a month or two ago, they were relishing the prospect of a chaotic Republican convention, with a floor fight and antiestablishment rebellion in the air. Now the messy, disastrous convention could be their own.

The polls in California are close. In addition, Clinton might be indicted by the DOJ over her emails or her corruption while Secretary of State. Nationwide polls say Sanders is more likely to beat Trump than is Clinton.