Protectionism seems to be in vogue amongst some of our younger liberal members, though, no?
Maybe I should clarify that I'm using "liberal" in the American sense of the word.
I think of it as a neo-mercantilist sentiment cropping up on both sides of the aisle. Some people are encouraging discrimination against goods and services provided outside of ones community, region, or country, thinking that purchasing foreign-made stuff or outsourcing jobs is in one way or another harmful to workers and/or national interests. I am reluctant to compare it to "free" or "fair" forms of trade since neither aims to rig terms of trade in favor of manipulating the market to mostly - if not overwhelmingly - benefit their own country rather than all of the nations involved.
There are a few instances where I fancy protectionism, but those stances are not meant to shelter Americans from foreign competition so much as to shelter developing countries from what may be terms of trade that threaten to harm their developmental prospects or cause humanitarian issues.