Thank you for your comment. But @Buckley’s Ghost has provided a reply. Its last sentence seems to lack a certain decorum, but provides a quote from Obama, or at least provide a usable paraphrase.
Your definition of the ‘marginal voter’ is exactly that, your definition. If you had read Brooks’ notion of ‘Theyism’ , it has no author, but is of the product of the zeitgeist. In sum, Brooks’ denial of intellectual/political responsibility!
Ganesh’s straw -man of the ‘marginal voter’, shares in Brooks’ denial of responsibility. It also serves a second rhetorical purpose: to construct an argument in which the ‘marginal voter’ shares the lead role in his political melodrama with Sanders, that equals a propinquity of political irrationalisms: ‘Socialism’, and ‘Social Justice Warriors’: one of the primary Myths of Jordan Peterson: who has faded from the political scene, like his long dead, invented enemy, the ‘Marxist Post-Modernists’ .