Celebvocate!

January Jones with Sen. John McCain on Wednesday. (AP Photo/Harry Hamburg)

An occasional look at the fleet of Hollywood missionaries seeking to inspire change on Capitol Hill. Wednesday's showbiz soldier: "Mad Men" star January Jones.

Mission: To meet with lawmakers as shark spokeswoman for conservation group Oceana.

Site: Sen. John McCain's office.

What she wants: Passage of bill to ban shark finning in U.S. waters.

How she looked: Gorgeous, skinny. Short black dress, strappy black heels, swept back do.

Observation: Sharks aren't evil -- she swam with them in Bimini and survived. "I was in their environment, and they couldn't have cared less about me."

How she did: Jones got home-state Sen. Tim Johnson (D-S.D.) to co-sponsor and McCain to back it, then charmed McCain into giving her a 30-minute tour of the Capitol, reports our colleague Juliet Eilperin.

Whom we passed up for her this week: Sigourney Weaver, warning about acid levels in the ocean; Wilmer Valderrama talking up Latino civic engagement (and oh, by the way, his new Disney Channel special).