Remember in 1972 when Tom Eagleton withdrew as the dem's VP nominee, the Democratic National Committee met and selected Sargeant Shriver as their replacement candidate. It's provided for in the party rules. Perfectly legal.
Thats well before my time (i was 8) but the fact that I have never heard any of those names seems to prove my second point.
It's provided for in the party rules. Perfectly legal.
Perhaps perfectly legal, but there are DEADLINES for ballots and names thereon.