1960: The 'TV look' of JFK saw frontrunner Robert Nixon lose his advantage.
1984: Reagan promises NOT To exploit his young opponent's "youth and inexperience".
1988: Dan Quayle is the victim of a great putdown from Dukakis' running mate, Lloyd Bentsen of Texas.
2000: When Al Gore moved into George W Bush's zone in 2000 the latter simply nodded in his direction. It was the most-remembered moment of the debate!
2004: Bush, debating with John Kerry, insists that he did not act alone in the Iraq war.
