Lee Daniels (left) is firming up the cast of “Selma,” his civil rights follow-up to “Precious,” even as its funding is on shaky ground. David Oyelowo (right), the British actor who appeared in “A Raisin in the Sun” and stars in George Lucas’ “Red Tails,” will play the Rev. Martin Luther King Jr. (Don’t get me started on why they’re casting a Brit to play an American icon: it isn’t as if Oyelowo’s physical resemblance to the Reverend is uncanny.) Hugh Jackman is on board as a racist sheriff in the tale revolving around the historic marches staged by King in 1965 in Selma, Ala. The part of Alabama Gov. George Wallace remains up for grabs — if there are funding problems, why don’t they cast Robert Pattinson?