1. How did the polls get it wrong?
The Polls did predict correctly that Secretary Clinton would win the Popular vote.

2. Electoral College Win/Popular Vote Loss
1824 John Quincy Adams v. Andrew Jackson
1876 Rutherford B. Hayes v. Samuel Tilden
1888 Benjamin Harrison v. Grover Cleveland
2000 George W. Bush v. Al Gore
2016 Donald Trump v. Hillary Clinton

3. Who voted/Who did not Who Did not vote for Secretary Clinton
Young People
African-Americans
Wisconsin Democrats
Who Voted for Donald Trump
Rust Belt Whites w/o College Education
Last minute decision makers