How many people will RomneyCare leave hanging?

In the debate Gov Romney said he would let each state craft their own insurance program to get everyone covered. That sounds good, but if each state did there own thing how many people would be left in the cold? If in New Mexico you were able to have a preexisting condition and still get coverage but then had to move to Colorado and they did not insure people with preexisting conditions, would that mean you’d have to pass on the job or go without insurance? What if you were traveling to Oregon and your insurance was from your home state of Nebraska which treated a particular ailment that Oregon did not recognize as an ailment; would you still be able to be treated and covered for that treatment or get a hefty bill for it? If the government has to write guidelines for the state to follow to keep it all even and consistent anyhow, how does that different from ObamaCare?