Who'll shave his mustache next?

(CNN) – With David Axelrod's signature mustache now a piece of history, who will be the next political heavyweight to go under the razor for charity?

The answer came Friday, when the top Obama adviser appeared on CNN's "The Situation Room" alongside Republican strategist Alex Castellanos.

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Castellanos announced he will shave his 'stache in January if they land 500 new donors to Citizens United for Research in Epilepsy this month.

"We're going to show that bipartisanship does live in Washington still and we'll get rid of this mustache," Castellanos said. "David and I do have a lot in common."

Castellanos joked that he started growing his moustache when he was "about two or three years old."

Earlier in the day, Axelrod appeared on MSNBC's "Morning Joe" to shave the moustache he's worn for 40 years. The arrangement began when Axelrod bet his facial hair that Obama would win Michigan, Minnesota, and Pennsylvania in the presidential election – which he did.

He extended the offer after the vote, saying his moustache would go if he was able to raise $1 million for the charity, which his wife chairs. The Axelrods' daughter has epilepsy.

That goal was met, and the moustache so familiar to politicos was gone by 8:30 Friday morning.

Axelrod himself teased today's announcement on Twitter:

[tweet https://twitter.com/davidaxelrod/status/277063563561017346%5D

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