The Senate tax bill is stuffed with provisions for special interests. Car dealerships would be able to fully deduct interest on loans, thanks to Sen. Rand Paul, R-Kentucky. Meanwhile, an amendment by Sen. Ted Cruz, R-Texas, allows parents to pay for K-12 private school tuition using tax-free college savings accounts. Republican Sen. Rob Portman of Ohio, where big private jet companies are based, reportedly got them exempted from a levy known as a "ticket tax."