Although there have been approximately 100,000 media profiles of enthusiastic blue-collar Trump supporters in diners, the reality is that Donald Trump is extraordinarily unpopular. A recent Pew analysis found only one other modern president with such a low approval rating two years into his administration.

On the other hand, that president was Ronald Reagan, who went on to win re-election in a landslide. So some Trump boosters are suggesting their champion can repeat that performance. Can he?

No, he can’t. And it’s worth understanding why, both to assess current political prospects and to debunk the Reagan mythology still infesting U.S. conservatism.

Let’s talk first about the Reagan story.

Reagan was indeed unpopular in January 1983, mainly because of the economic situation. Despite a huge tax cut in 1981 and a sharp rise in military spending, more than 10 percent of the labor force was unemployed.

Also, a housing boom driven by dramatic interest rate reductions was central to the rapid growth of Reagan’s third and fourth year in office. (No, it wasn’t all about the miraculous effects of tax cuts.)

But today’s Fed can’t — literally can’t — deliver the kind of boost it did back then by bringing double-digit interest rates down to single-digit levels, because rates are already quite low. And with housing prices looking rather high, it’s hard to imagine a huge surge looking forward.

Are there other ways that the economy might rescue Trump? What about the 2017 tax cut, which Trump said would be “rocket fuel” for the economy?

Well, by increasing the budget deficit, that cut probably gave the economy some stimulus, temporarily raising growth. But that effect is already fading out, and the economy would have been slowing down even without the extra drag created by the Trump shutdown. This doesn’t necessarily mean that we’ll have a recession soon, but we’re almost surely looking at unimpressive growth at best.

But wasn’t the tax cut supposed to increase long-run growth, by increasing business investment? Yes, it was — but it isn’t delivering on that promise. Corporations received huge tax breaks, but they mostly used the money to pay higher dividends and buy back stocks, not for investment. And even the modest rise in business investment that did take place in 2018 seems to have been driven by higher oil prices, not tax cuts.

So Donald Trump is no Ronald Reagan.

Actually, even Ronald Reagan was no Ronald Reagan. Although right-wing legend portrays his experience as proof of the magical power of tax cuts, the economy actually performed somewhat better under Bill Clinton, who raised taxes. (Although, to be fair, almost all Republicans seem to have managed to expunge that fact from their memories.)

Most of Reagan’s political success reflected not fundamental economic achievement but good luck with the timing of the business cycle. And Trump almost certainly won’t experience comparable luck.