Look, I think Marco Rubio is as big an ass as everyone else. But, The Rube, as I'm going to start calling him and try to convince others to call him, bought the house in 2005 for $550,000. He's making a 22% profit on it after owning it, and likely renovating it, over 8 years. He's walking away, if he gets his asking price, which isn't likely in Florida, $125,000. From the look of the house he probably put $50k into the kitchen, which is relatively new, and another $50k into the patio and pool. Subtract the interest payments and he's walking away with no more than $10,000 in profit.
The thing is, he's probably going to lose money on his house. The house values in his neighborhood are half of what he's asking for. He probably overpaid back in 2005.