Who played Alicia Florrick in 'The Good Wife'?

Who played Jeff Winger in 'Community'? Who played Troy Barnes in 'Community'? Who played Abed Nadir in 'Community'? In which TV series is Abed Nadir a main character? In which TV series is Alicia Florrick a main character? Who played Elena Gilbert in 'The Vampire Diaries'? In which TV series is Elena Gilbert a main character? Who played Damon Salvatore in 'The Vampire Diaries'?