Why? Thirty hours without fighting over politics wasn't good enough for you?
Okay fine, here's some fuel for you.
Moody's Credit Rating, the guys who rate big name bonds and stocks and know more about money than almost anybody, have said they may downgrade the American government's credit rating if
the tax cut deal goes through. Basically, banks and other institutions both foreign and domestic invest in government bonds because they're supposed to be rock solid investments - they don't gain much, but they always pay back.
Moody's is basically in the business of selling money, and they are anything but ideologues or enemies of the American government, and are also about the biggest name in credit appraisal that the world looks to for deciding what to invest in. The package altogether is expected to cost about $900
billion dollars over whatever measure of time the Congressional Budget Office measures these things in. About $500billion of that is the continuation of 35% income tax for $250k and up incomes, compared to the current rates expiring and raising to about 39%.
Moody's official assessment is that whatever positive effect throwing money at the already wealthy might have on business investment and activity, the core economic policy America has pursued for about thirty years, would be so totally subsumed by the crippling debt as to be meaningless. And therefore, they're threatening to stop recommending American bonds as a sure investment. Ladies and gentlemen, this is the tipping point.