7. Joshua Malina (David Rosen)
Many of Joshua's fans remember his as Will Bailey on The West Wing and Peter Alpert on In Plain Sight. He's also had recurring roles as President Siebert on The Big Bang Theory and was seen as Kenny Mitchell on The Larry Sanders Show and Jeremy Goodwin on Sports Night.
8. Tony Goldwyn (President Fitzgerald Grant)
Tony's guest roles go all the way back to St. Elsewhere, Matlock and Designing Women in the '80s. Later he can be spotted on Without a Trace, The L Word, Dexter, and Law & Order: Criminal Intent.
9. Scott Foley (Jake Ballard)
Scott's credits go back to '90s hits like Dawson's Creek (Cliff Elliot) and Felicity (Noel Crane). He was also regularly seen on Scrubs, Cougar Town, Grey's Anatomy and True Blood but perhaps the job that best prepared him for taking on Jake Ballard was his role as Bob Brown, member of the special forces Alpha Team on The Unit.
10. Bellamy Young (Mellie Grant)
Bellamy started off as Dr. Courney Evans on Another World. But she later had many in guest spots including The Drew Carey Show, The X-Files, ER, NCIS, Castle, The Mentalist and Grey's Anatomy. Or maybe you noticed her on CSI Miami, Dirty Sexy Money's Ellen Darling, Dr. Miller on Scrubs or Beth Clemmons on Criminal Minds before finally become our favorite devious first wife on Scandal.
Wait! There's more! Just click "Next" below: