President Biden’s campaign and affiliated groups are amping up their efforts in South Carolina, pouring in money and staff ahead of the first Democratic primary in February in an effort to generate excitement for his campaign in the state.

It seems, at first glance, to be a curious political strategy. Few incumbent presidents have invested so much in an early primary state — particularly one like South Carolina, where Mr. Biden faces no serious primary challenger, and where no Democratic presidential candidate has won in a general election since Jimmy Carter in 1976.

But the Biden campaign sees the effort as more than just notching a big win in the state that helped revive his struggling campaign in 2020, putting him on the path to winning the nomination. It hopes to energize Black voters, who are crucial to Mr. Biden’s re-election bid nationally, at a moment when his standing with Black Americans is particularly fraught.

“One of the things that we have not done a good job of doing is showing the successes of this administration,” said Marvin Pendarvis, a state representative from North Charleston. He added that the campaign will need to curate a message “so that Black voters understand that this administration has done some of the most transformational things as it relates to Black communities, to minority communities.”