WASHINGTON (Reuters) - Republican presidential candidate Rick Perry said on Wednesday he was wrong to say that opponents of his immigration policy in Texas have no heart, as he sought to dampen conservative ire over the comment. Perry, the Texas governor, has drawn fire from rival candidates Mitt Romney and Michele Bachmann over remarks he used to defend a measure that allows children of illegal immigrants to pay cheaper in-state tuition rates at Texas colleges. The policy is outside usual conservative orthodoxy and Perry compounded the issue by saying at a Florida debate last week to those who oppose it,...