Click on graph for large image.This graph shows the Freddie Mac single family delinquency rate and the unemployment rate since 2005.
Note that the unemployment rate y-axis starts at 4% to match up the curves.
Here is the Freddie Mac portfolio data.
There are many reasons for the rising delinquency rate. Earlier today we discussed some new research suggesting a number of homeowners with negative equity are walking away from their homes ("ruthless default"). There are also negative events that can lead to delinquencies - like death, disease, and divorce - but one of the main drivers is probably loss of income.