Such as whom?!?!?!?!?!?!?!!!!
We will know who is in the running for POTUS as they step forward.
Why are you panicking? We have lots of time yet. Jimmy Carter was an unknown to most of us when he won the Democratic Primary. Sarah Palin stepped from an unkown to a VP candidate in one instant.
Panicking and letting the way too early polls dictate the candidates is what put the sexualy perverted Rudy Giuliani in the lead for so long and brought us the much despised John McCain as our candidate.
There are many possible candidates, most of them relatively unknown. Relax and let the system work as it is designed to.