This piece in the Atlantic wonders why the 2024 presidential field is so slow to materialize. When Donald Trump gave his 2019 State of the Union address, several of the Democrats listening inside the House chamber had already declared their plans to run against him. But when Joe Biden delivers his speech tomorrow night, his only official competition will be Trump. My colleague Russell Berman wondered over the weekend, Does anyone want to be president? By the time a president gives the State of the Union address at the beginning of his third year in office, at least half a dozen people are typically already in the presidential race, Russell explained. But this year is different. Besides former South Carolina Governor Nikki Haley, who is expected to announce her candidacy next week, the 2024 campaign is off to an extremely slow start. “This [is] what happens when you have a former president who lost reelection but still inspires fear in his party, along with a Democratic incumbent—the oldest to ever serve—who is not exactly itching to campaign,” Russell explained. Allies of President Biden have said that they expect him to formally announce his reelection bid sometime after tomorrow’s State of the Union, but the announcement could also be months away. A late announcement isn’t unusual for incumbents, who are already familiar to voters and want to be perceived as being focused on their presidential duties. And at this point, the president’s allies are assuming that Biden would have the Democratic field all to himself. But…