Marco Rubio’s Presidential Bid Creates Open-Seat Scrum

Marco Rubio’s Presidential Bid Creates Open-Seat Scrum-rollcall: Marco Rubio on Monday became the third Republican senator to announce a bid for president and the first of the group to leave behind a competitive seat. Rubio vacating his seat in Florida in favor of national ambition gives the GOP another potentially strong White House contender. But it presents new challenges for Senate Republicans pushing to hold their newly acquired majority by leaving an expensive open seat in a state at the heart of the presidential election.