Jackie Sharp. Played by: Molly Parker. What she does: House majority whip. Jackie Sharp spends a lot of time insisting that she isn’t Frank Underwood. And that’s true, but it doesn’t mean she won’t go to extreme lengths to get her way. That was clear from the beginning when she destroyed a lifelong friend’s reputation to become whip. She’s one of the strongest, most uncompromising characters on the show, and her desire to do it all without becoming Frank makes her fascinating.