Mike Huckabee recently said in a speech that if the Republican Party doesn’t continue to vigorously fight same-sex marriage, he will leave the party and become an independent. See this story.
In 2008, Huckabee ran for the Republican presidential nomination and polled the third highest number of popular votes in Republican presidential primaries. He received 4,191,028 votes, just behind second-place finisher Mitt Romney, who got 4,525,616. John McCain, who got the 2008 nomination, polled 9,862,865.