It is ok to support no one, but in doing so, you should not make any comments biased for or against any of them either, unless you plan on balancing the load.
BTW that is impossible to do.
I love politics, I just don't think any of the candidates on either side are POTUS material. A POTUS Candidate should have proven EXECUTIVE experience. That eliminates everyone but Romney, Guliani, and Huckabee. Arkansas has a tiny economy, not big enough to qualify it's Gov. for the top executive position in the world. New York City has a bigger economy than many states and lots of countries. Giuliani has the executive experience for the job, but no foreign policy or military experience. His positions, however are the same as Hillary's and his personal life is a mess. Mitt has the best executive experience, but the same criticisms apply to him as to Rudy EXCEPT he leads an exemplary personal life.
I don't like the choices. There are thousands of people with better experience than any of these guys who won't run because they don't want to be savaged in the process. It's a shame. I will support the nominee, however, because any Republican is better than ANY Dem.