As he has so often in the past, Alan Grayson is itching for a fight. For the second time, he is about to run against Florida’s incumbent Republican U.S. Sen. Marco Rubio. Grayson, 63, a pugnacious, progressive and former three-term representative from Orlando, is almost certain to join the Democratic challenge to Rubio in a race that is expected to cost more than $50 million. Central Florida Cong. Val Demings is planning to join the race, and another area Congress member, Rep. Stephanie Murphy, is also considering joining the race. Grayson is already in his trademark full attack mode, and h...