Everyone replying is missing this oppositized JFK quote: "We choose to go to the moon in this decade and do the other things, not because they are easy, but because they are hard."
I think possibly lots of people are missing it. How well known is Kennedy's speech for those who weren't alive at the time? And yes it was a joke, but contained within the joke is a pointed commentary.
I think it's one of the most famous quotations in the country (it has it's own wikipedia page[0]), and the reference wasn't exactly subtle. I'm betting most downvoters (myself included) got the reference.
Sorry, a bit dense maybe, but what's 'oppositized' about it? That looks like a verbatim quote to me.
EDIT: Oh, not your usage! You're suggesting people somehow haven't realised the GP was mis-quoting JFK, I guess? I think it's more likely that everyone reading that GP comment realised, since it was a pretty obvious context for the reference.
-JFK