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It's official. It appears the mortgage interest deduction is now in play when it comes to the fiscal cliff debate. President Barack Obama signaled that the interest deduction may go away unless Republicans agree to increase taxes on higher income earners.

The exchange took place on Twitter Monday, as the President was taking to social media to drum up support for his administration's stance that higher earners should be taxed more as part of Democrats' proposed solution to the so-called fiscal cliff. 

Here's the Twitter exchange: 

The President signs tweets he personally authors with "-bo." And with that, the mortgage interest deduction is officially in play. Will be interesting to see how this plays out in the weeks ahead.