Ed Gillespie, Rep. Rob Wittman and Corey Stewart will all speak at a Saturday festival.
The National Rifle Association Political Victory Fund gave Chris Koster an A rating.
The clip shows veterans watching deride John McCain's service and claim he knows more about ISIS than generals.
Libertarian presidential nominee Gary Johnson trails the pair by 19.8 points.
Sean Spicer said Clinton shares President Obama's "misguided" economic beliefs.
"I'm a Democrat, and that's worth fighting for," Nina Turner said.
"His movement is moving on," Jill Stein said.
Reid Wilson 07/21/16 01:13 PM EDT
Kansas Secretary of State Kris Kobach is a rising GOP star.
Trump's selection of the Indiana governor for his running mate has set off a mad scramble.