The issue has been 'lurking/waiting in the wings' [=it has been waiting to be dealt with] for several years.
He's known as a comic actor, but he's 'spreading his wings' and trying a serious role in his new movie.
His nomination is supported by the party's 'left wing' but opposed by the right wing.
(..) when she went to heaven... ...she wanted a red taffeta petticoat, so stiff that it would stand by itself... ...and so rustly, the Lord would think it was made of angels' wings. Why, she won't take it from you. She'd rather die than wear it. That may be, but I'm making the gesture just the same. (..)1939 Gone with the Wind