On September 30, 1788, Pennsylvania became the first state to elect its two senators. On March 4, 1789, the first group of elected senators reported for duty. From 1789 to 1913, when the Seventeenth Amendment to the U.S. Constitution was ratified, senators were elected by state legislatures.
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Presidential campaign formally begins after they are nominated in the national convention, the September before a presidential election, though they might do some informal campaiging beforehand.
Note: You <em>can </em>run without being nominated. (independents such as Donald Trump aren't going to get nominated because they don't belong to a party)
3. Unusually shaped rocks!