I saw this comedian on the Late Show with David Letterman a couple of
years ago and want to know who he was.

I can?t remember what he looked like; all I can remember is part of his routine:

"I?m not married, so my married friends are always trying to tell me
how great marriage is. But whenever I ask them how their marriage is
going, they look constipated.

How?s the marriage thing going?

[constipated look on his face]It?s good, it?s good.

[starts rubbing his nose] No really it?s good, it?s good. You should
really try it. You?re missing out."

Who was this comedian?