evidence: UNIVERSITY PARK, Pa. — President Joe Biden announced he is dropping out of the 2024 presidential race, leaving Vice President Kamala Harris the top contender for the Democratic nomination. Biden’s decision not to seek re-election comes after the states held their presidential primaries and his campaign raised tens of millions of dollars. [...] Speel: In coming weeks, we will see Kamala Harris choose a vice-presidential candidate. We will see if she chooses a running mate who excites and galvanizes the Democratic base — and some independents, the way her candidacy has so far — or if she chooses someone experienced and safe, like Hillary Clinton did with Senator Tim Kaine of Virginia in 2016, and Barack Obama with Biden in 2008, and Michael Dukakis with Senator Lloyd Bentsen of Texas in 1988. I expect that Republican lawsuits to try to prevent the Democratic National Convention from nominating anyone other than Joe Biden will fail. There is nothing in any law or in the U.S. Constitution regulating how political parties choose candidates, other than campaign contribution limits.