She's already broken barriers, and now Kamala Harris could shatter several more after President Joe Biden abruptly ended his reelection bid and endorsed her. Biden announced Sunday that he was stepping aside after a disastrous debate performance catalyzed fears that the 81-year-old was too frail for a second term. Harris is the first woman, Black person or person of South Asian descent to serve as vice president. If she becomes the Democratic nominee and defeats Republican candidate Donald Trump in November, she would be the first woman to serve as president. Biden said Sunday that choosing Harris as his running mate was “the best decision I've made" and endorsed her as his successor. Prominent Democrats followed Biden's lead by swiftly coalescing around Harris on Sunday. However, her nomination is not a foregone conclusion, and there have been suggestions that the party should hold a lightning-fast “mini primary” to consider other candidates before its convention in Chicago next month. A recent poll from the AP-NORC Center for Public Affairs Research found that about 6 in 10 Democrats believe Harris would do a good job in the top slot. About 2 in 10 Democrats don’t believe she would, and another 2 in 10 say they don’t know enough to say. The poll showed that about 4 in 10 U.S. adults have a favorable opinion of Harris, whose name is pronounced “COMM-a-la,” while about half have an unfavorable opinion. A former prosecutor and U.S. senator from California, Harris' own bid for the 2020 Democratic presidential nomination imploded before a single primary vote was cast. She later became Biden's running mate, but she struggled to find her footing after taking office as vice president. "Needless to say, this moment is a specific point in history and something that the country doesn't typically see. Political conventions are often seen as performative and celebratory and ceremonial. But it looks like Democrats will have their work cut out for them when they gather in Chicago and formally sort out exactly who will be facing Donald Trump in the general election," said AP national political reporter Meg Kinnard.