Final answer:
No, all electors in a state do not have to vote for the same person for President.
Step-by-step explanation:
No, all electors in a state do not have to vote for the same person for President.
The Electoral College system allows for electors to cast their votes for two persons, and at least one of those persons must not be an inhabitant of the same state as the elector.
After the electors vote, they make a list of all the persons voted for, along with the number of votes each person received and transmit this list to the President of the Senate.
The President of the Senate then opens the certificates, and the results are counted. The person with the greatest number of votes becomes the President. If there is a tie, the House of Representatives chooses the President.