FAYETTEVILLE, N.C. — Everywhere he turns, President Joe Biden and his campaign are playing defense across the 2024 electoral map. That is except for one state: North Carolina. In the Tar Heel State, where Biden and Vice President Kamala Harris are set to visit Tuesday, favorable demographics, a string of major Republican nominees painted as extreme and a rapidly changing electorate that only narrowly backed former President Donald Trump in 2020 has Democrats feeling optimistic about their chances to flip the crucial battleground. But with Biden’s popularity lower since his last run, Republicans here aren’t fretting yet. Polling shows Trump...