So people continuously insured should be able to get new insurance. Therefore, those that have developed a condition while they were insured and then change jobs, lose jobs, go to a new place, apply for new insurance would be guaranteed issue in that new entity so that you don’t have to have people worried about a preexisting condition preventing them from becoming insured.

source: The Page by Mark Halperin | The Complete Romney Interview Transcript.

The whole issue with preexisting conditions is it is an issue for un- or underemployed folks who are uninsured for at least a designated period of time who have an illness and seek insurance. Not for the employed. This answer quite frankly makes no sense. When you go to a new job, you aren’t “applying for new insurance” you are joining coverage under an existing group.