If you ever wonder why it takes so long for presumptive presidential nominees to name their running mates, even those who effectively wrap up their nominations relatively early in the nominating season, consider this hypothetical:

What if, two weeks ago, Joe Biden determined that he wanted to make a splash and had announced his vice presidential choice early?

Already struggling to break through the news cycle, Biden reasoned that picking his running mate would give him an important new surrogate to help make the case for his candidacy.

In making his choice in this hypothetical situation, Biden prioritized three major factors: proven success in an electorally important region; high-level experience to assist him as a governing partner in the White House; and a pedigree that would reassure voters the vice president could take over as president if necessary and/or become the next Democratic presidential nominee four or eight years from now.