MIAMI -- It is either a Wild West revival, a return to the days of "shoot first and ask questions later," or a triumph for the "Castle Doctrine" -- the notion that enemies invade personal space at their peril. Such dueling rhetoric marked the debate over a measure that Florida Gov. Jeb Bush (R) could sign as early as Tuesday. The legislation passed so emphatically that National Rifle Association backers plan to take it to statehouses across the nation, including Virginia's, over the next year. The law will let Floridians "meet force with force," erasing the "duty to retreat" when...