What Happens If A Presidential Election Ends In A Tie?

U.S. presidential elections are tightly contested and some races are too close to call. So what happens when candidates tie?

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2016 Democratic race was the party's closest Iowa caucus race yet (msnbc.com)
"Former Secretary of State Hillary Clinton and Sen. Bernie Sanders' miniscule difference of 0.2 percent Monday night is the narrowest margin between two top Democratic presidential candidates in the Iowa caucus' 44-year history."

What Is The Electoral College? How It Works And Why It Matters (huffingtonpost.com)
"The Electoral College will dominate the airwaves and the headlines on Election Day Tuesday."

Bush v. Gore (2000) (pbs.org)
"In Bush v. Gore (2000), a divided Supreme Court ruled that the state of Florida's court-ordered manual recount of vote ballots in the 2000 presidential election was unconstitutional."

Deadlock over presidential election ends (history.com)
"After one tie vote in the Electoral College and 35 indecisive ballot votes in the House of Representatives, Vice President Thomas Jefferson is elected the third president of the United States over his running mate, Aaron Burr."