-What if there is a tie within an individual state's house delegation over whom that state should award its electoral votes.
The Constitution requires that "a majority of all the states shall be necessary to a choice" (Amdt. XII), implying that, in order to win, a candidate must win (not just tie) a majority of the state delegations.
The House must vote again, until it can reach a decision. If the House is unable to reach a decision by Inauguration Day (January 20), then the Twentieth Amendment states that the Vice President becomes Acting President until the House can decide.