As GOP presidential candidates take the debate stage Tuesday at an extravagant Las Vegas hotel, they will once again compete for voters in an increasingly unpredictable race. But they are also vying for the attention of the man who owns the building – and no candidate has worked harder than Florida’s Marco Rubio.

As GOP presidential candidates take the debate stage Tuesday at an extravagant Las Vegas hotel, they will once again compete for voters in an increasingly unpredictable race. But they are also vying for the attention of the man who owns the building – and no candidate has worked harder than Florida’s Marco Rubio.