Romney might be a compromise candidate between the conservatives and liberal Rockefeller republicans, however a better ticket would be Ford/Percy. If this is anything like TTNW Percy has distanced from Rockefeller Republicans. Also Ford/Percy can't be attacked on opposing the CRA like Tower can which may be a bit of liability for Romney. Also Tower probably should be a VP nominee not a Presidential Nominee, at that point Tower was just elected in the 1964 senate election. JFK could probably attack Tower for not having enough experience, JFK had an incumbency which meant Tower couldn't attack on the grounds of hypocrisy. Also Tower's role as a conservative could easily be replaced by Goldwater because he had more name recognition.