President Biden is taking on his former rival Donald Trump, seeking to frame the 2024 presidential election as a contest between them before he announces whether he will actually seek reelection. Since the midterm elections, when Democrats were able to hold off an expected Republican wave to retain the Senate, a more confident Biden has poked Trump and Republicans regularly. The swipes have been particularly noteworthy in recent days as speculation mounts over whether Biden, bolstered by those midterm successes himself, will seek another term. Trump-backed candidates lost in a number of races, and Democrats believe they benefit from Trump’s...