St. Louis beer heiress Trudy Busch Valentine (D) joined the heated race for Missouri’s U.S. Senate seat Monday, the St. Louis Post-Dispatch reports. The move triggered former state Sen. Scott Sifton (D) to exit the Democratic primary race and throw his support to Valentine. If Republicans

Former Missouri Gov. Jay Nixon (D) announced he won’t run for U.S. Senate in Missouri. The decision could deprive Democrats of a high profile candidate in a race that could be competitive if former Gov. Eric Greitens (R) is the Republican nominee.

Missouri Secretary of State Jay Ashcroft (R) announced he would not run for the U.S. Senate seat being vacated by the retirement of Sen. Roy Blount (R).

Sen. Claire McCaskill (D-MO) is out with a very effective ad recounting her experience in beating breast cancer while blasting rival Josh Hawley (R) for joining a lawsuit that could undo Obamacare’s protections for those with pre-existing conditions. http://www.youtube.com/watch?v=zwlN9tKD-wA