SARASOTA, Fla. — Republican presidential front-runner Donald Trump bragged about his high standing in the polls, slammed super political action committees and dismissed rivals Marco Rubio and Jeb Bush in a campaign stop Saturday in their home state of Florida. Speaking before thousands who jammed into the Robarts Arena in Sarasota, Trump said he’s “killing everybody” in polls nationally and in early voting states. He called super PACS “a scam” because the millions of dollars raised are going to high-priced consultants and advisers, and are making candidates beholden to big donors. He criticized Rubio as “weak” on illegal immigration and said his constituents should be angry with him because Rubio has missed so many Senate votes. “I’m leading in Florida against a sitting senator,” Trump boasted.