LITTLE ROCK, Ark. (AP) — Mike Huckabee is turning into a front-runner for his party's 2012 presidential nomination almost by default. A pair of sex scandals involving Republicans once touted as White House contenders and the abrupt exit of another hopeful from the public stage are helping Huckabee boost his odds as he weighs another presidential run. "Given that the dominoes are falling, the fact that he's still standing works to his benefit," said Hal Bass, political science professor at Ouachita Baptist University.