The Catholic Church’s stance on issues predates the liberal/progressive Democratic Party by more than a few years. It is part and parcel of Church teaching at least since Rerum Novarum which was written both as a concern for the poor and the workingman and as a guide for defending against the extremes of Marxism and Socialism.
Thanks for that sententious, but irrelevant little lecture. The church's teachings sure failed at defending against the extremes of socialism. Unless by defending you mean embracing.