Who played Frank Underwood in 'House of Cards'?

In which TV series is Mike Ross a main character? In which TV series is Rachel Zane a main character? Who played Olivia Pope in 'Scandal'? Who played Hannah Horvath in 'Girls'? Who played Claire Underwood in 'House of Cards'? In which TV series is Claire Underwood a main character? Who played Piper Chapman in 'Orange Is the New Black'? Who played Crazy Eyes in 'Orange Is the New Black'?