State Sen. Kyle McCarter is poised to launch a primary challenge to GOP Sen. John Shimkus in Illinois’ 15th District later this week, according to GOP sources. The news shouldn’t come as a complete surprise. McCarter has been openly discussing the possibility with fellow Illinois Republicans since at least August, when I wrote about him in The Rothenberg & Gonzales Political Report. In the last few days, McCarter has been calling various Republicans across the state and has unveiled a new campaign logo (noticeably void of the office he intends to seek) at the Little Egypt parade in Salem on...