What happens if there is a tie in the popular vote?
The same thing that happens when there is not a tie in the popular vote – nothing! The Electoral College elects the president. The nation-wide popular vote has no legal significance in our electoral system so a tie would not effect anything, nor require a recount. Now a tie in the popular vote within a state? That does matter! If a state had a tie in its popular vote, they would have a recount. If (after what would probably be several recounts) the vote was still tied, then state law would govern as to what happens next.