Freddie Mac

When millions of borrowers were locked into high-interest mortgages that hiked their monthly payments to unaffordable levels, mortgage giant Freddie Mac made it more difficult for them to refinance to lower-interest loans, to avoid cutting into company profits, according to a published report.

Welcome to the front lines of the housing crisis. Florida and three of the next states to vote in the GOP presidential contest are among the 10 worst foreclosure states in the nation. And there's not much light at the end of the tunnel: The four states have the highest percentage of homeowners who…