I happened to be watching the show and browsing Twitter, so I followed @GayObama and took a screen shot when there were 17 followers (I was No. 17). In three minutes, the follower count shot up to more than 2,000. It hit 3,000 shortly after, and then the growth slowed (slightly).
So, there you go. Just get Jon Stewart to mention your Twitter feed and wham—thousands of followers. It appears Stewart is to Twitter what Oprah is to books.
Here are the screen shots (with the time I took them) to illustrate it.
Image No. 1: 10:13:45 p.m. Central time.
Image No. 2: 10:14:51 p.m. Central time.