Comedy Central's Stephen Colbert said the presidential election matters because there is a difference between the way President Obama and Mitt Romney would govern -- but it's not clear what the difference is. 

"I'm not Ralph Nader. You know what I mean? I don't think that there's no difference. There is a difference. I don't know what the difference is, though," Colbert said in an interview broadcast Sunday morning on NBC News's "Meet The Press." 

Colbert sat for the interview with NBC's David Gregory both in out of the character he portrays on "The Colbert Report." When weighing in on the differences between Obama and Romney, Colbert was speaking out of character. 

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"I think that there is a possibility that Obama would be, say, more aggressive -- a more aggressive reformer or changer in the second act of his presidency," Colbert continued. "And I don't really know how -- I also don't know how Mitt Romney would govern. He might govern as a technocrat. You know, that sort of seems to have been his career -- as, like, the guy from Pepsi who comes in to run G.M. You know, he can't tell us what he's going to do, because he hasn't seen the books yet."

Colbert added that Romney seems "sincere" as both a moderate and a conservative. "That's not a dig. It's honest confusion," he said. 

Colbert said that if Obama wins, "I hope he keeps some of the promises he didn't keep the first time."

The Comedy Central show host also weighed in the way he approaches his satirical program, and what he hopes to accomplish. 

“I falsely reconstruct the news,” Colbert said, adding, “If I do it, and something in the news is doing it, that real thing is probably bull.”

Updated at 11:23 a.m.