Despite his emergence in the polls over the last two weeks, Cokie Roberts still isn't coming close to considering Herman Cain a legitimate candidate for the Republican presidential nomination.

During ABC's This Week panel discussion Sunday morning, the NPR figure labeled Cain as just another "flash in the pan."

"Herman Cain is just this week's or this two week's 'Not Romney,'" she said. "We have had an entire season of 'Not Romney. 'Whether it was Rick Perry or Donald Trump or Herman Cain or Chris Christie, this is 'this week's.'"

Roberts added: "Until the Republicans decide it's the "Not Romney or Romney is the nominee, we are going to have these people pop up."

WATCH: Video from ABC News, which appeared on October 30, 2011 (Skip between 1:18 to 1:46 for selected highlight).

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