Is this a typo or did Obama seriously screw up?

BGR:

I was cool, man. Jaded Political Observer. No screaming, just observing. Cool. Right up until about one minute into Obama's speech, when he asked who in the crowd had seen him at the rally he headlined at the Papa John's stadium in 2006.

I don't know where to begin. Obama never held a rally at Papa John's Cardinal Stadium. It was LOUISVILLE SLUGGER FIELD.

I pray that this is a typo from the person who wrote this on Bluegrass Roots. Please say it is! Otherwise, this is a major mistake on Obama's part. Does he really not remember the name of the stadium he spoke at in 2006?