Marco Rubio endorsement of Mitt Romney signals GOP fight may be ending

Although Mitt Romney arrives here today to claim the endorsement of the first president Bush, it’s the backing this week from Sen. Marco Rubio that is the bigger prize.

The Florida Republican is the last in a line of prominent Republicans to get behind Romney in recent weeks, including Florida Gov. Jeb Bush and kind words from South Carolina Sen. Jim DeMint. But Rubio — a prominent Latino lawmaker with roots in the tea-party movement — offers Romney cover with conservatives who have been hesitant to support him.