AP is reporting tonight that about 500 unionized news writers could soon join their creative colleagues on the picket lines. cbs_news.jpgThe writers, employees of CBS News television and radio, are expected to overwhelmingly approve a strike authorization. Represented by WGA East, the writers are scheduled to vote Thursday. Working under an expired contract since April 2005, the writers—who work in New York, Los Angeles, Washington DC and Chicago—may not necessarily stage a work stoppage, but CBS News says it’s prepared for the possibility of a strike. The parties have not been negotiating since January after the union rejected CBS “final offer”.