Off topic but related. Romney would have made a good president and I'm not convinced he won't run again; Reagan ran twice before grabbing the brass ring. With a minor image make-over Romney could be viable in '16.
Here's an interesting tidbit. When there is an incumbent in office, Democrats always nominate a party favorite. Examples are Humphrey, McGovern, Mondale, Dukakis, Gore, Kerry. But, when there is not an incumbent in office, Democrats have NEVER selected a well known name to run in that year. It's always been an outsider like Carter, Clinton and Obama.
Therefore, with no incumbent in office, Hillary will be the next example of a party favorite to NOT be selected nominee -- with Democrats likely choosing Elizabeth Warren.
By the way, it's the exact opposite with Republicans. They always select nationally well know party favorites when there is no incumbent in office. Examples are Nixon, Reagan, Bush (and perhaps, who knows, Romney).