In which TV series is Shawn Spencer a main character?

In which TV series is Tami Taylor a main character? Who played Betty Suarez in 'Ugly Betty'? In which TV series is Betty Suarez a main character? Who played Shawn Spencer in 'Psych'? In which TV series is Don Draper a main character? Who played Peggy Olson in 'Mad Men'? In which TV series is Peggy Olson a main character? Who played Joan Holloway in 'Mad Men'?