When it comes to candidates (rather than office holders) the rules actually come from the political parties, not the Constitution. For Republicans, if a Presidential candidate dies or drops out, the RNC has to either convene a new convention or take an official poll of the RNC’s state representatives to select a replacement candidate. Most likely, the RNC would move the running mate up to the top of the bill, in order to preserve what fundraising has already been done for the ticket.
But for the Democrats, it’s not so clear. The Democratic National Committeereserves the right to replace a candidate who dies or drops out, and it doesn’t provide additional details in its by-laws. So presumably the Democrats would have to make up the process up as they go along. The DNC could entrust replacing Clinton to a central DNC brain trust or, more likely, replicate the RNC’s system, handing the vote over to the committee’s state delegates. – READ MORE