How low will U.S. mortgage rates go?

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Federal Home Loan Mortgage Corporation (AMEX: FMCC) Delayed: 3.91 --0 (-0%)
Previous Close $3.91    52 Week High $3.18 
Open $3.91    52 Week Low $0.00 
Day High $3.91    P/E N/A 
Day Low $3.91    EPS $-1.51 
Volume 40       

Federal National Mortgage Association (AMEX: FNMA) Delayed: 4.21 --0 (-0%)
Previous Close $4.21    52 Week High $3.25 
Open $4.21    52 Week Low $0.00 
Day High $4.21    P/E 0.29 
Day Low $4.21    EPS $14.71 
Volume 40