The latest entry into the Texas poll sweepstakes is SurveyUSA whose poll conducted Feb.23-25 shows Barack Obama leading Hillary Clinton 49 percent to 45 percent, a gain of 4 points for him and a loss of 5 points for Clinton. SurveyUSA says Obama’s margin is right at the edge of the 3.8 percent margin of error for the poll. This depiction of a close contest is pretty much in line with other Texas polls. That’s a smaller margin than yesterday’s double-digit leads for Obama reported by the New York Times/CBS News and USA Today/Gallup polls.