Everybody knows that Liberal was redefined, and that formerly it was what we now call Libertarian.
People are less familiar with the fact that Progressive was redefined. People who call themselves progressives these days are more accurately described as socialists or leftists in most cases.
Those who bear the true standard of the original Progressive movement today don't carry a particular name.
The hallmarks of the original Progressive movement were a "muckraking" press exposing corruption and proposing solutions. This occured around the turn of the 20th century. At the time, industrialists dominated the country and factored in most of the corruption.
Today, it's a mixed bag. There are corrupt leftists as well as corrupt right-wingers in government and society.
The acid test for me is the public employee unions. If you're a real progressive, you want to disentangle both unions and corporations from government. When you say that, the reaction you get really separates the wheat from the chaff. There isn't a whole lot of wheat out there, but it exists. The true progressive, Neoprog, if you will, recognizes that there is just as much muck to rake from one side of the aisle as the other.