Reply in the 1936 election, Franklin D. Roosevelt won by a landslide over Landon, he got 61% of the vote and 523 electoral votes to Landon's 8. In the 2016 election, Trump won the electoral vote while Hillary won the popular vote by 2.1%. What is similar with these two elections is that researchers relied on polls, surveys, etc to determine that the opposing runner was to win. But they ended up losing by a gap to the presidential winner.
A) Swing states
B) Margin of error
C) Polling inaccuracies
D) Electoral college system