If you start with the linked piece, you can find one or two places where cracks are starting to show. Here's one I think’s telling:

During the first Republican debate last summer, Mrs. Clinton’s campaign manager, Robby Mook, shushed a room full of people at the campaign’s Brooklyn headquarters when Mr. Trump started to speak, almost giddily captivated by the wildness of his remarks. “Shh, I’ve got to get me some Trump,” he said.

Most folks dislike Clinton and Trump. Trump’s shown he can survive who-do-you-dislike-more contests, eating the broadly-disliked Jeb Bush’s lunch, for instance. For now, Clinton’s gladly winning red state primaries in states she’s not likely to carry in the general election. Candidates with unfavorability ratings like hers typically lose in the general, even without opponents like Trump that drive yooge increases in turnout for the other side.

Most folks do like Sanders, despite Clinton’s best efforts so far. Once Clinton walks away with the Democratic presidential nomination, when it’s crystal clear to the Sanders crowd how undemocratic the Democratic Party is, how many Sanders supporters are going to walk away as well? Clinton and the DNC are working night and day to depress eventual Democratic voter turnout in the general election.

The linked article, dictated to a Times s̶t̶e̶n̶o̶g̶r̶a̶p̶h̶e̶r̶ reporter by the Clinton campaign, makes all the tacit assumptions it naturally would have coming from within the corporate-Democratic establishment. Here’s a Lulu:

While Mrs. Clinton radiates positive energy on the trail, Democratic groups are beginning to coalesce around a strategy to deliver sustained and brutal attacks on Mr. Trump.

This, about a would-be health care reformer who now lectures widely about how single-payer will “never, ever” happen. Now, I may not fathom all that eleventh-dimensional chess they supposedly play over there in the halls of power, but even I can tell who’s likely to get more votes in a general election bile-milking contest with Trump.