The former Republican senator from Pennsylvania appeals to his party's social conservatives. Rick Santorum won the Iowa caucuses in 2012, but this time around he faces a crowded Republican field.
Huckabee, who previously sought the presidency in 2008, hosted a television program on Fox until January, when he ended the eponymous show to consider his political future.
Clinton, a former secretary of state, U.S. senator from New York and first lady, is the first Democrat to officially announce a presidential run — and she's by far the favorite to win the nomination.
The Republican senator from Kentucky is getting a jump on what is likely to be a crowded GOP field in 2016. Polls show him in a three-way tie for third place for his party's nomination.
The former Florida governor and likely GOP presidential candidate, in a tweet, responded to his son's playful mocking of the claim with: "My mistake! Don't think I've fooled anyone!"