Over the past 30 years, Republicans have nominated the runner-up during the previous Republican primary (when not featuring a GOP incumbent) three times. Of these, Bob Dole won 30 percent of the electoral vote in 1996 (losing by 220 electoral votes), John McCain won 32 percent in 2008 (losing by 192), and Mitt Romney won 38 percent in 2012 (losing by 126). Only once during this stretch have the Democrats nominated last time’s loser: Hillary Clinton, who won 42 percent of the electoral vote in 2016 (losing by 77).

Meantime, the two parties have combined to nominate four candidates over that span who weren’t last time’s loser and hadn’t previously been elected as president or vice president. Among such “new blood” candidates, George W. Bush won 50.4 percent of the electoral vote in 2000, John Kerry won 47 percent in 2004, Barack Obama won 68 percent in 2008, and Donald Trump won 57 percent in 2016.

In sum, new blood candidates have three wins to one loss over the past three decades (winning an average of 56 percent of the electoral vote), while last time’s losers have zero wins and four losses (winning an average of 36 percent).

When they nominate last time’s loser, however, at least Democrats don’t generally pick someone who has already been rejected by the general electorate.