Republican presidential candidate Mitt Romney has received the endorsements of immigration hard-liners such as Arizona Gov. Jan Brewer, former California Gov. Pete Wilson and Kansas Secretary of State Kris Kobach. (Associated Press)

Republican presidential candidate Mitt Romney has received the endorsements of immigration hard-liners such as Arizona Gov. Jan Brewer, former California Gov. Pete Wilson and Kansas Secretary of State Kris Kobach. (Associated Press)