DUBUQUE, Iowa — Mitt Romney's rally here Saturday afternoon drew an unexpected attendee: conservative commentator Glenn Beck.

According to a pool report of the event, Beck landed in a private jet roughly 20 minutes before the rally and was spotted using a cane.

He was seen watching the event from the side; afterward, he chatted with NASCAR driver Richard Petty on the tarmac before getting on the jet and taking off. Beck tweeted from the tarmac that he was en route to Chicago.

In a January interview, Beck said that he had injured himself while bending over to pick up a pencil. He was left with "four herniated discs," he said.

Beck, a Romney supporter, made an appearance Friday night as the featured speaker at a Columbus, Ohio, rally organized by the conservative FreedomWorks.

In September, he devoted an episode of his "Glenn Beck Program" to detailing what he termed "the Real Mitt Romney" through interviews with people the former Massachusetts governor has helped at various times in his life.

At the end of the program, Beck said: "Vote for Romney or don't vote for him. It doesn't matter to me. What I hope you take out of this is: 'I could do better.' "