I'd think the best way to represent Corsica would be to have it always be won by "favorite son" candidates when applicable, so Wilbur Mills in '72.
What do we mean by 'hard-left'? The PCF, the Trots, the left-wing of the PS? or the American hard-left which in France would be moderate PS lefties?
It'd be difficult to say since America is a two-party system and France is a multi-party system, so "all of them." The American (white) "hard-left" (unions, environmentalists, feminists etc.) all lined up behind Mondale, so much so that he was quite effectively attacked (with justification) by both Hart and Reagan as having a campaign totally run by special interests. The white people who supported Jackson, especially after the "Hymietown" incident, were generally of the Marxist variety.