Future leaders of the free world.
Unfortunately for most second-term presidents, they aren't really going to like a lot of the people showing up to their party. That's because incumbent parties almost always lose seats in Congress during midterm years, which tend to hit two-term presidents especially hard. Like, historically hard. It's a phenomenon political scientists call the six-year itch, which, coincidentally, is also an apt description for herpes.
Thomas Jefferson is the only U.S. president in history whose party gained House and Senate seats during his sixth year in office, and all but one president since Woodrow Wilson lost seats in both the House and Senate their second term. The lone wolf? Of course: Bill Clinton, whose Democratic Party benefited immensely from his brewing impeachment, which actually boosted his approval numbers by 10 points among voters who understood that, in all truth, blow jobs are pretty great.
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Still, nearly getting bounced from a sweet gig isn't exactly good news for any president, especially if you consider ...