[Responsibility2nd]

I wonder if # 6 has someting to do with winning party conventions.

I googled William Jennings Bryant. Found out he was a 3 time Democratic Party nominee.

[SAJ]

The question says that Bryan failed three times, so it wouldn't be 'winning party conventions' because he most certainly did that.

The key point in the question is that BOTH Goldwater and Johnson did it. They ran against each other. What can both the winning candidate and the losing candidate do in the SAME election.

Got me stumped (for now), and boy that's annoying!