December 22, 2013  By: Mark Glennon   “I still can’t believe that no other media outlet has yet picked up on the fact that the unions and others are about to jump into the GOP primary against Rauner.” That’s from influential political reporter Rich Miller yesterday. Union bulletin boards are alive with discussion about the idea, with the Illinois Education Association — a teachers’ union — apparently at the forefront of the possible effort.   Unions are freaked out that Bruce Rauner, an outspoken critic of public unions, has taken the clear lead in the Republican race for governor. Yesterday,