The Electoral College wasn't able to elect a president. Thus the vote goes to the House of Representatives, which you are a member of.
Candidate A has won your state, but Candidate B has won your congressional district. Both received the same number of votes nationally. A third candidate hasn't been nominated by the Electoral College. Neither candidate is considered controversial, plus you consider both qualified to be president, but you feel obliged to put the will of the electorate into action.
Scenario α You are a member of candidate A's party.
Scenario β You are a member of candidate B's party.
Scenario γ You are an independent member of the House.
But mind, you are not from Nebraska or Maine, and you are from a state that is divided into several congressional districts.