saying bring it on. senator rand paul refusing a pat-down at an airport security checkpoint after setting off an alarm on a body scanner. he s joining us live this hour. he ll tell us what happened. also, a key u.s. supreme court ruling on electronic surveillance. the justices agree that police need a warrant to plant a gps device on a suspect s car but they don t agree on why. i m wolf blitzer and you re in the situation room. what a day in politics. mitt romney is going all out as he goes after newt gingrich with a series of very bitter attacks. the new national poll out today may show why. the two rivals are in a statistical tie. the gallup daily tracking poll shows romney at 29% nationwide, down nine points in just over a week. gingrich is at 28%, double his strength in the last poll a week ago. it s a dead heat, just a week and change before the florida primary. let s bring in cnn jim acosta. he s in tampa and watching the battle for florida. it shouldn t be.