Please do not confuse "liberalism", the moral philosophy espoused by Locke/Montesquieu/Mill et al., with "liberal" as used as an adjective in modern-day US politics. The two have almost nothing to do with each other.
The Rawlsian veil of ignorance[1] that the modern American left is pretty much based on is largely an extension of Locke.
Sure, there are some economic ideas that the early liberals had that most modern liberals (and modern conservatives for that matter) would eschew, but to reduce their thinking to being purely libertarian does a disservice to the modern left, which needs all the historical support it can muster.