Mortgage Rates Mainly Flat Even with Debt Ceiling Scare

Fixed mortgage rates were mostly unchanged this week as credit markets showed little reaction to Washington's impasse over raising the federal government's borrowing limit.

Freddie Mac says the average rate on the 30-year fixed loan ticked up to 4.55 percent from 4.52 percent a week ago. That's slightly above this year's low of 4.49 percent.

The average rate on the 15-year fixed loan was unchanged at 3.66 percent, just above the yearly low of 3.65 percent. >> More.