Want to know why we are celebrating President’s Day this Tuesday? Check out Why Tuesday? for the history of President’s day.

CQPolitics has a year-by-year history of American primaries from 1912-64, their first installment in a series.

This is non-election related but still fun history. From the Washington Post:

ON A WARM AND RAINY THURSDAY EVENING IN JULY 1941, inside a War Department office in Washington, a small group of Army officers hastily assembled for a meeting and listened in disbelief to the secret plan outlined by their commander.