"Homeland" won this category last year for its debut season. "Boardwalk Empire" won in 2010 and was also nominated in 2011.
"Downton Abbey" competes for the first time as a drama series. Last year, it won Best Movie/Miniseries.
"Breaking Bad" is nominated for the first time in this category. Star Bryan Cranston has received multiple nominations.
This is the first nomination for HBO's freshman drama "The Newsroom."