Mataconis is correct to note Santorum was merely repeating a tired trope from Populist, reactionary conservatism.
The question is, are they now in danger of losing the Populist narrative?
But the Irish-Australian stayed in him wherever he went—Italy, England, and New York—as a deeply democratic, Populist instinct.
1892 (n.) "adherent of populism;" 1893 (adj.), American English, from Latin populus "people" (see people (n.)) + -ist. Originally in reference to the U.S. Populist Party organized February 1892 to promote certain issues important to farmers and workers. The term outlasted the party, and by 1920s came to mean "representing the views of the masses" in a general way.