What if the IRS comes up with some rule that you can't engage in political speech and keep your mortgage deduction?
Give it up, and you can say what you want. In the meantime, they're giving you a benefit, so you better shut up.
I could case less about a mortgage deduction, besides it isn't that big a deal when you are only getting it times your tax rate. If it was a deduction from taxes it might be meaningfull.
Personally it means nothing since I haven't had one in 20 years after I paid off the only I ever had and any property since then has been for cash.