What if a Party's Nominee Dies Before Election Day?

[SteveRogers]

Republicans and Democrats both have it in their bylaws that their national committees (not the convention) can convene an emergency meeting to replace the nominee. Now if this happens too late for the nominee to be changed on the ballot in a number of states, then you have a problem. It could potentially be left to the party's electors to rally around a candidate, and the election would be thrown to the House the electors were split such that no candidate received a majority of electoral votes.