Princeton professor and Hillary Clinton campaign adviser Alan S. Blinder tries to explain the odd fact that Americans think the country is on the wrong track, even as there are signs of economic improvement.

He argues that the real reason for public frustration is political gridlock, and blames Republicans for it: “Each party deserves a share of the blame, I suppose, but certainly not an equal share. The fact is that congressional Republicans have blocked almost everything and proposed little.”

Blinder is completely wrong, and it is useful to illustrate exactly why he is wrong, because his misconception is shared rather widely among Democrats.

First, it is necessary to point out that the period of “gridlock” coincides with the period of economic recovery Blinder cites. The Tea Party wave of 2010 ensured that Democrats’ wild spending spree was over, and their more ambitious politics would be held in check. “Gridlock” restored a modicum of fiscal restraint and a degree of certainty to government in general.

As in the 1990s, when the economy boomed despite partisan clashes, gridlock is good when it stops government from doing bad.

Furthermore, the reason there is gridlock is simply that what President Barack Obama and the Democrats have attempted to do for eight years has gone beyond the boundaries of the the Constitution; beyond the previous limits of what both parties considered possible; and, often, beyond what they themselves promised voters that they would do.

These are just some of the more salient examples — and in many cases, these policies remain very unpopular.

Obama came into office with a plan for “fundamentally transforming the United States of America,” abusing his mandate to force changes that only one party wanted — and that previous generations of Democrats would never have contemplated.

Given that reality, the question is not why Republicans created “gridlock,” but why they were not more effective in stopping Obama’s agenda.

Time and again, Republicans actually compromised. The Tea Party class of 2010 voted to pass the Budget Control Act and avoid default in 2011. They also accepted higher taxes on the rich in 2012. The GOP-led Senate, elected in 2014, allowed the Iran deal to slip by.

True, House Republicans blocked immigration reform, but look how Obama treats Sen. Marco Rubio (R-FL), who put his career on the line for it: Obama campaigned against Rubio in Florida last week.

Donald Trump is the voters’ response to years of frustration.

The real obstructionists are Obama and the Democrats, who even defied the courts when their policies were overturned. And watching Hillary Clinton run for office when any ordinary person would have been prosecuted –for mis-handling classified information, destroying evidence, and lying under oath — has only added to Republicans’ justified anger, whether they support Trump or not.

Meanwhile, amidst sluggish economic growth, a collapsing foreign policy, and heightened fears about terrorism, Democrats refuse to understand their own party’s unconstitutional excesses and ongoing, self-made policy failures.

That, given the evidently strong possibility of a Hillary Clinton win in November, is the most worrying fact of all.

Joel B. Pollak is Senior Editor-at-Large at Breitbart News. His new book, See No Evil: 19 Hard Truths the Left Can’t Handle, is available from Regnery through Amazon. Follow him on Twitter at @joelpollak.