Former President Donald Trump is no longer the only candidate in the 2024 Republican primary. On Tuesday Nikki Haley announced that she’s running for president too. Haley was the United Nations ambassador under Trump and a governor of South Carolina — and now the second major candidate in the GOP race. Haley’s presidential bid isn’t just significant because she’s the first candidate to openly challenge Trump. As a child of Indian immigrants, she’s also the first woman of color — and the fifth woman ever — to run for the Republican presidential nomination. Haley’s race and gender are particularly noteworthy because Republican women of color are rare in elected office, although their numbers did grow after the 2020 election. The fact that she’s going up against Trump will sharpen the contrast, particularly if he uses the racist and sexist attacks he’s employed against past challengers. There’s a reason why we were speculating that Haley could be the first female president in 2020 — she...