~~~~~~~~~~~~
1. Buchanan failed to head off secession and the Civil War.
2. Andrew Johnson's decision after the Civil War to side with Southern whites and oppose improvements in justice for blacks beyond abolishing slavery.
3. Lyndon Johnson allowed Vietnam War to intensify.
4. Woodrow Wilson refused to compromise on the Treaty of Versailles after WWI
5. Richard Nixon's involvement in the Watergate cover-up.
6. James Madison's failure to keep the US out of the war of 1812 with Britain.
7. Thomas Jefferson's Embargo Act of 1807 prohibitting trade with Europe during the Napoleonic Wars.
8. John F Kennedy's Bay of Pigs Invasion.
9. Ronald Reagan's Iran-Contra Affair.
10. Bill Clinton's Lewinsky scandal.
~~~~~~~~~~~~~~~~~~~~~~~~~~
Of course, we've already shown that they're all wet.

SOURCE