President Joe Biden and Vice President Kamala Harris join hands at an event at Prince George's County. Annabelle Gordon/CNP/ZUMA

Less than a month ago, President Joe Biden was still the Democratic nominee and Donald Trump and his allies all but assumed they would easily carry the 2024 presidential election in November. But since Biden’s historic decision to step out of the race and endorse Vice President Kamala Harris, the dynamics of the race have dramatically changed. Democrats seem reenergized and Trump and his campaign now have reasons to worry. And recent polling numbers show why.

According to the latest New York Times/Siena College poll, Harris entering the race has shaken up the political map and made crucial Sun Belt states competitive again. In Arizona, for example, Harris is now leading Trump 50 to 45 percent. She also has a narrow advantage in North Carolina, a state........

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