Former Sen. Rick Santorum of Pennsylvania has a commanding lead among Republican presidential candidates in Texas, according to a new University of Texas/Texas Tribune poll. Santorum would get the votes of 45 percent of the respondents if the election were held today, according to the survey. The other three candidates in the GOP race-former U.S. Speaker Newt Gingrich, former Massachusetts Gov. Mitt Romney and U.S. Rep. Ron Paul of Texas--are clustered well behind. Gingrich got 18 percent, Romney received 16 percent and Paul garnered 14 percent.