Donald Trump is leading Marco Rubio in the Florida senator's home state by 8 percentage points, a Monmouth University poll out Monday shows. Trump has the support of 38% of Florida's likely GOP primary voters, compared to 30% who back Rubio, 17% for Texas Sen. Ted Cruz and 10% for Ohio Gov. John Kasich. The snapshot of Florida comes before the state's crucial 99-delegate, winner-take-all primary set for March 15. It's a must-win for Rubio, who has fallen behind Trump and Cruz in the delegate race after taking only two of the first 20 Republican contests. The poll undercuts the...