What happens if a party cantidate is unable to finish the election due to illness or dying before the general election

Wow, I never thought it would take this long to have an answer to this question and I have went so far as to look everywhere i could think of for an answer and still nothing.

Then the party will elect a new candidate and the general election process will start all over again.

I think that the runner up would then go, if there was time.

like right now, Obama and Hillary are still going at it. If one of them would be unable to run, then the other would automatically win the nod.

if it was after they won the democratic nod, then it would be a toss up I think, betwn the selected vice president candidate and the loser from the general election

I know which to chose as a winner there are only 2 answers and thety are different and I stil don't know which is correct. Come on some body help me out here.

Sorry I meant to say I did not know which one to choose as best answer.

The party would nominate a new successor to the candidate. Such was the case when Robert Kennedy was assassinated before the general election. The party then had to put forth a new nominee (I apologize that I can't remember the new nominee's name off-hand). This situation also happened in a foreign country with Benazir Bhutto's assasination. The country then had her son represent her in the election.

Now if a candidate wins the election and dies while they are in the President-elect status (the time between the election and January 19th when they are sworn in), then the elected Vice President would become the President as is set forth by the Constitution.