Since the 2008 economic recession, the financial sector has attracted plenty of righteous scorn. Mr. Sanders has harnessed that disgust and resentment to great effect. The Occupy Wall Street movement has played a large role in making Mr. Sanders’s message more broadly acceptable. Marina Sitrin, one of the early organizers of the movement, said it had “normalized looking at the roots of the problem rather seeing them as individual.”

Still, Democrats who work in finance have been frustrated by Mr. Sanders’s broad anti-Wall Street rhetoric. The people I spoke to noted that the “Wall Street” Mr. Sanders rails against isn’t just made up of plutocratic hedge-fund types and predatory lenders, but money managers trying to help middle-class workers retire comfortably, and bankers trying to help small-business owners get a loan.

Todd H. Baker, a lawyer and lifelong Democrat who has worked as an executive at three large banks, wrote recently in The New York Daily News that Mr. Sanders’s campaign should not “smear” people like him as part of the problem, or call campaign contributions from the financial sector a “sign of corruption.”

This election cycle seems to be proving that Wall Street has lost some of its political influence. In the first half of 2015, securities and investment workers gave $30 million to try and elect Jeb Bush. But piles of Wall Street money couldn’t save Mr. Bush, who proved to be a startlingly inept candidate ill suited for the Trump era.

Securities and investment employees have donated roughly $21 million to Mrs. Clinton’s campaign and the outside groups that support her, according to the Center for Responsive Politics. By comparison, that sector has given $12 million to Mr. Cruz and $3 million to Mr. Kasich; it doesn’t even crack the top 20 list of industries that have donated to Mr. Sanders.

During her time representing New York in the United States Senate, Mrs. Clinton had a mixed record on financial regulation. She proposed several bills to crack down on Wall Street, but they died without garnering support from her colleagues. In October 2008, as the economy was mid-nosedive, Mrs. Clinton was one of 39 Democratic senators who voted for the $700 billion bailout of the financial system, a fact that Mr. Sanders won’t let her live down.

Whatever happens today in New York, it does seem as though voters’ trust in large institutions on Wall Street — along with the news media, Congress and political parties writ large — has eroded to the point of invisibility.