Would a presidential candidate be able to change his/her running mate after ballot papers have been printed?
For example, Independent Candidate Evan McMullin placed "Nathan Johnson" from California as his placeholder running mate mistakenly. However, some states already have the ballot papers printed, thus the name he used as a placeholder will appear on the ballots.
According to an article by the Politico, it quoted an official from Utah saying that changing it now isn't allowed:
“The clerks will begin printing the ballots now, so there is no way to change it. Yes, Johnson is the VP,” Mark Thomas, director of elections in the Utah lieutenant governor’s office, said after his office finished certifying the state’s ballot last week.
Can a presidential candidate place different running mates for different states? If so, who will be the Vice President if elected?
The same article also states that he can place a different running mate in other states:
The good news for McMullin is that, even if Johnson’s name on the ballot is permanent in eight states, he can still put a different name on his upcoming applications for other state ballots. And in the one-in-a-million scenario in which McMullin wins the White House, he would be able to have the new person sworn in as his running mate.
Article by Politico: http://www.politico.com/story/2016/09/evan-mcmullin-running-mate-227803
Update: Evan McMullin has chosen Mindy Finn as his running mate, so what would happen to 'Nathan Johnson' who is still on the ballot?