FILE - In this July 14, 2015, file photo, Republican presidential candidate Wisconsin Gov. Scott Walker speaks during a campaign event at a Harley-Davidson dealership in Las Vegas. Walker is scheduled to address an annual showcase of conservative activists, Thursday, July 23, in San Diego.
FILE - In this July 14, 2015, file photo, Republican presidential candidate Wisconsin Gov. Scott Walker speaks during a campaign event at a Harley-Davidson dealership in Las Vegas. Walker is scheduled to address an annual showcase of conservative activists, Thursday, July 23, in San Diego. John Locher AP
FILE - In this July 14, 2015, file photo, Republican presidential candidate Wisconsin Gov. Scott Walker speaks during a campaign event at a Harley-Davidson dealership in Las Vegas. Walker is scheduled to address an annual showcase of conservative activists, Thursday, July 23, in San Diego. John Locher AP