Why does Trump get a Pass for Pledging Economic Populism, but they Ask Sanders about the Cost?

But promises and following through on them are two different things. In case you have not been keeping up, Trump has failed to implement any of the above pledges. Since he got away with making promises that he had no intention of keeping, we can expect Trump to repeat that performance during the 2020 general election campaign.

Why does Trump get a Pass for Pledging Economic Populism, but they Ask Sanders about the Cost?