"Give me a horse, a gun and an open plain, and we can conquer the world," the Republican senator told a recent roundtable of business owners in San Marcos, one of America's fastest-growing communities, fueled by booming job markets in nearby Austin and San Antonio. Cruz won 11 states and finished a surprising second in the GOP presidential primary, but his popularity may be slipping nationally and back in Texas after he refused to endorse Donald Trump and was booed at the Republican National Convention. Cruz did an about-face in late September and said he supported Trump, but that now looks like unfortunate political timing, coming two weeks before the release of a 2005 video in which the billionaire businessman can be heard bragging about grabbing women's genitals and kissing them without permission. Cruz isn't up for re-election until 2018 but he now may face a serious challenger in Texas' Republican primary for U.S.