She returned to Broadway in 2009 as Veronica in God of Carnage, with her performance earning her the Tony Award for Best Actress in a Play. Harden's television credits include the political drama series The Newsroom, the medical drama series Code Black, the legal thriller series How to Get Away with Murder, and the Apple TV+ drama series The Morning Show. She received her first Primetime Emmy Award nomination for her role as FBI Special Agent Dana Lewis in the crime drama series Law & Order: Special Victims Unit, and earned a second Primetime Emmy Award nomination for her performance as Janina Krzyżanowska in the television film The Courageous Heart of Irena Sendler (2009).