EXCLUSIVE: Bradley Whitford, an Emmy winner for The West Wing and then most recently for Amazon’s Transparent last year, has signed with ICM Partners for representation. On the film side, he most recently appeared in Sony Pictures Classics’ Hank Williams biopic I Saw The Light opposite Tom Hiddleston, which bowed in March. Whitford is next up playing Hubert Humphrey in HBO’s LBJ movie All The Way, which debuts May 21. Also in the can: Netflix's Sundance pic Other…