Rep. Sam Yingling (D-Grayslake), left, and former Rep. Mary Edly-Allen (D-Libertyville), right, are facing off in the Democratic primary for the 31st Senate District. [Sam Yingling/Facebook and Mary Edly-Allen website]

Sen. Melinda Bush (D-Grayslake) decided to end her Senate career after 10 years in Springfield and is now backing former Rep. Mary Edly-Allen (D-Libertyville) to be her successor in a competitive primary against veteran lawmaker Rep. Sam Yingling (D-Grayslake).