When Sen. Ted Cruz launched his U.S. Senate bid, he was the preferred choice of a mere 3 percent of Texas Republican primary voters in a field of a half-dozen credible candidates. Chief among his rivals was a powerful three-term lieutenant governor, David Dewhurst, who possessed a net worth of $200 million, enjoyed the near-unanimous support of the Texas GOP establishment and began the 2012 election cycle with a commanding lead in the polls.