LEO: Andrew Jackson, in the main foyer of his White House had a big block of cheese.
LEO: I am making a mental list of those who are snickering, and even as I speak I am preparing appropriate retribution. The block of cheese was huge - over two tons. And it was there for any and all who might be hungry.
TOBY: Leo, wouldn't this time be better spent plotting a war against a country that can't possibly defend itself against us?
LEO: We can do that later, Toby. Right now I'm talking about President Andrew Jackson.
SAM: Actually, right now, you're talking about a big block of cheese.
And one of my favorite moments:
MAN 1: [on radio] Negative intercept. KM warhead has overshot it's target.
BARTLET: It was just enthusiastic.
LEO: By how much?
GENERAL: Uh, Leo...
LEO: [sternly] By how much did it miss the target?
LEO: We missed the target by 137 feet?
LEO: [looks at him, incredulous] We missed it by 137 miles?!
BARTLET: When you consider the size of outer space, Leo, that's not so bad.
BARTLET: By the way, the words you're looking for are "Oh good grief." [walks out]