Follow in the Fed's footsteps
It’s no-brainer following the Fed.
As Ben Bernanke promises to buy $40 billion mortgages every month, QE3 and perhaps QE4 is bound to push prices of mortgages higher as it pushed interest rates lower. Use Uncle Sam as your investment adviser.
After all the Uncle happens to be the biggest buyer in fixed income markets as long as Quantitative Easing is our monetary/fiscal policy.