MIKE Huckabee will have gays on the war path when his new book, “Do the Right Thing,” hits stores next week. “[Heterosexual] marriage matters . . . nothing in our society matters more,” writes the ex-Arkansas governor, whom some see as the GOP front-runner to take on Barack Obama in 2012. “Our true strength doesn’t come from our military or our gross national product; it comes from our families. What’s the point of keeping the terrorists at bay in the Middle East if we can’t keep decline and decadence at bay here at home?”