'The Newsroom' Adds Joel Johnstone And More Casting News

"The Newsroom" is rounding out Mitt Romney's staff. According to The Hollywood Reporter, Joel Johnstone will recur on "The Newsroom" as Cameron, a Romney campaign staffer in New Hampshire.

Look for the character to work alongside Grace Gummer's new character, Hallie Shea, a reporter embedded in the campaign.

Johnstone has also booked a gig on HBO's "Getting On" opposite Laurie Metcalfe.

In other casting news ...

Denis O'Hare will guest star on "Law & Order: SVU." O'Hare will play Father Shea, a role he originated on "Law & Order: CI." [TV Guide]

"Covert Affairs" star Piper Perabo will guest star on "Go On." Perabo will appear in three episodes as Simone, a former member of the support group. []

"Giant Baby" is staging a "Dancing with the Stars: All-Stars" reunion. Gilles Marini will co-star opposite Kirstie Alley in the TV Land pilot. [Facebook/Gilles Marini]

Sherri Saum will guest star on "Revenge." The "Rescue Me" actress tweeted the news, but has since removed the posting. [Indiewire]

"Army Wives" is beefing up its Season 7 cast. Ashanti, Torrey DeVitto and Elle McLemore will all be series regulars on the Lifetime series. [THR]

"The Newsroom" Cast Character Introductions