You’re applying today’s conservative logic to a decision made in 1988 when Texas was controlled by Democrats and had been for decades. Gore was the most conservative Democrat at that time. He was pro-life, pro-guns, pro-defense, and pro-tobacco. Gore’s primary campaign didn’t succeed because he was too conservative to win the Dem nomination. Perry switched parties shortly after that campaign when he realized that his values were a better fit with the Republican platform than with the Democratic platform, which was being taken over by the hard-core, extreme-left nutcases.