An occasional look at the celebrities who come to Washington to talk up a favorite cause. Wednesday’s visitor: Jennifer Garner.

Jennifer Garner with Sen. Bob Casey, left, and Chris Dodd. (Leigh Vogel/Getty Images)

Venue: Hotel conference room packed with Hill staffers, advocacy folk.

Bona fides: Star of TV’s “Alias” and many adorable rom-coms; mom of three; wife of Ben Affleck (in town to promote “Argo” — maybe they carpooled?); loyal advocate for Save the Children of four years standing.

Backup: Chris Dodd, Sen. Bob Casey, Mark Shriver of Save the Children, Bruce Lesley of First Focus.

What she wants: More government aid for poor families, expansion of early childhood education, etc.

Garner at the Russell Senate Office Building — totally appropriate outfit, right? (Leigh Vogel/Getty Images)

How she sounded: Like an old pro, well past the rattling-off-stats stage of early celebvocacy. Garner shrewdly deployed vivid anecdotes from her field visits to impoverished communities.

Soundbite: After telling her 6-year-old daughter she had to go to D.C. for meetings on the Hill and at the CIA, Violet scribbled out a note: “Dear Senators and CIA, please give my mother the money she wants for Save the Children.”

Earlier: Garner’s been coming to D.C. for Save the Children since before we’d even quite coined the phrase “celebvocate”, 5/6/09

Read more about our visiting Celebvocates

Also in The Reliable Source:

Sarah Palin revealed by dad, brother in “Our Sarah: Made in Alaska” memoir

Andrew Sullivan is not done with D.C. yet

In other news: Beyonce bails on Eastwood; Polanski’s victim speaks

Quoted: Dominique Strauss-Kahn on orgy guest lists

Andrew Breitbart documentary follows late right-wing rabblerouser’s war with the media

Sean Duffy’s mom agrees to vote for him

Steve Martin, Samuel Jackson: Can stars make a mark on campaigns with viral videos?