There were some skeptics (just read through the comment thread), but believe it or not, it worked! With the help of their own readers, the /r/comics crew, and the rest of the Internet, here's what happened:
Hey guys!
Just wanted to say Dave got his O1 visa, and the bulk of our "supplemental evidence" was a bigass stack of names on an Internet petition. This may very well mark the first time in history that an online petition has changed something, even if it was just getting a guy into the United States to make silly stick figure animations.
I know a lot of you Redditors signed it, so I just wanted to let you know that it worked. And to say thanks.
Thanks.
The Drill Down
In other news, Chris and I were on a live podcast last night. It's called The Drill Down. We had fun and talked about a lot of stuff.
You can download a recording here, or just search for "the drill down" on your podcast-listening device and look for episode #151.