A new Public Policy Polling survey in Florida -- the first taken after Fred Thompson ended his presidential bid -- shows Mitt Romney leading among Republicans with 28%, followed by Sen. John McCain at 25%, Rudy Giuliani at 19% and Mike Huckabee at 15%.
Key finding: "The key to Romney's lead is the immigration issue. 15% of the state's GOP voters listed immigration as their biggest concern and within that group, 50% support Romney compared to just 14% for McCain. It isn't the biggest issue in the state -- the economy and the war in Iraq were listed by more respondents -- but it is the one creating the greatest separation between one candidate and the rest of the pack."