QUOTE(aevans176 @ Oct 12 2005, 09:41 PM)
I personally don't see any politician sigining any bill that would actually stifle their personal or party's ability to garner votes, in which case a bill that cut mortgage deductions out completely would do just that.
For what it's worth, there is a foreign precedent.
There used to be a tax break on British mortgages for residential property (i.e. you couldn't get it for commercial loans, or on second homes that were not the primary residence) called Mortgage Interest Relief At Source (acronumised to MIRAS). The "At Source" bit meant that your mortgage provider deducted the tax relief at from your monthly payments before demanding the money, so the individual homeowner didn't pay the money and then claim it back, they just never paid it. (Our income taxes work in much the same way through the PAYE system - employere deduct the tax from the paycheck so you
pay
as
you
earn.)
This was first introduced (I think) in the early days of the Thatcher government, and you got tax relief on the first £30,000 of your mortgage repayments at your highest rate of income tax (up to 40%, depending on income). Interest rates were very high at the time, due to general economic mismanagement (or global market effects, if you're a Thatcher supporter

), so MIRAS was worth a lot of money even if you paid the lowest rate of income tax (25% at the time).
But over time, house prices and average incomes rose. Shortly before, and resiliently after, Blair got in, interest rates went down into single figures. The first £30,000 of a mortgage became a less significant chunk, and the MIRAS became worth much less than it used to be, in both absolute AND relative terms.
Plus, it was seen by Labour as a tax break for the (relatively) wealthy, and they planned to do more for those lower down (back in the early days, they still had some vaguely socialist ideas). They phased it out over their first three years in government, from 25%/40% to 15% for everyone, then the next year down to 5%, then it was gone altogether.
I bought my house in 1996 and it cost more than the threshold limit, so I got my full Thatcherite MIRAS. With interest rates high (by today's standards) at about 9 or 10% my MIRAS was worth perhaps £30 per month - less than the saving I got a few years later when I moved my mortgage to a new provider at a lower interest rate.
This illustration is intended to show that a politician CAN remove mortgage tax breaks without losing any electoral support (at the next election after MIRAS went, in 2001, Blair's majoirty INCREASED).
However, it also shows that timing is everything. AMT might be able to be phased out over a long period, so (like MIRAS) by the time it finally goes, nobody really notices. But Bush doesn't really have that long left, so he's left with a sudden cut-off or nothing. And, as
aevans176 says, it's pretty unlikely that any sane politician would want to throw votes away by such a sudden cut-off. Whatever else we might be able to say about Bush (and I'm no fan), he isn't insane.