Back in the distant mists of time — the early 1970s — a young Garry Trudeau penned a Doonesbury strip where two legislators grumble over the difficulty of definitively nailing Richard Nixon. “If only he’d knock over a bank or something.” “By George, we’d have him then!”
I had to google it...
http://www.robcottingham.ca/index.php?m=20041125