AUSTIN, Texas — Texas is preparing to give college students and professors the right to carry guns on campus, adding momentum to a national campaign to open this part of society to firearms. More than half the members of the Texas House have signed on as co-authors of a measure directing universities to allow concealed handguns. The Senate passed a similar bill in 2009 and is expected to do so again. Republican Gov. Rick Perry, who sometimes packs a pistol when he jogs, has said he’s in favor of the idea.