Rep. Darrell Issa (Judy Kurtz/The Hill)

Rep. Darrell Issa (R-Calif.) might have thought his popularity numbers were through the roof when some fans sought him out Friday and asked for autographs. The only problem is, those requesting Issa’s John Hancock didn’t realize it was the House Oversight Committee chairman they were hounding — they thought it was “Mad Men” star Jon Hamm.

The congressman exclaimed to ITK at Saturday’s White House Correspondents Garden Brunch in Georgetown, “Last night they kept thinking I was Jon Hamm. I’m trying to outgrow that, but I can’t. So they kept thinking they saw a celebrity and then were disappointed.”

Tony Goldwyn (Judy Kurtz/The Hill)

When we inquired as to what he tells the autograph seekers who think he’s Hamm, he deadpanned, “I don’t say anything.”

Saying with a smile he “absolutely” signs autographs as the AMC star, Issa advised, “If you’re mistaken for somebody popular, as a politician, take it.”

As a hoard of reporters chatted with Issa, former America Online CEO Steve Case strolled by. So, ITK asked, does Case think Hamm is Issa’s doppelganger? “Of course,” replied Case, before adding, “he’s much more handsome.”

He quickly continued with a hearty laugh, “I need his support on immigration, so I’ll say anything!”

Follow The Hill's In The Know columnist Judy Kurtz (@JudyKurtz) and Features Editor Emily Goodin for (@Emilylgoodin) this weekend for live updates from the White House Correspondents' Association dinner and related parties.