WordNet (r) 3.0 (2006):

pork barrel
    n 1: a legislative appropriation designed to ingratiate
         legislators with their constituents [syn: pork barrel,
         pork]

Moby Thesaurus II by Grady Ward, 1.0:

66 Moby Thesaurus words for "pork barrel":
   Fort Knox, backscratching, bank, barter, blackmail, boodle, booty,
   bursary, cash register, cashbox, chest, coffer, coin box,
   depository, even trade, exchequer, favors of office, fisc,
   gold depository, graft, haul, hot goods, locker, logrolling, loot,
   melon, money chest, patronage, penny bank, perks, perquisite,
   pickings, piggy bank, plum, plunder, political patronage, pork,
   prize, public crib, public till, public treasury, public trough,
   repository, safe, safe-deposit box, spoil, spoils,
   spoils of office, squeeze, stealings, stolen goods, storehouse,
   strong room, strongbox, subtreasury, swag, swap, swapping, switch,
   take, till, trade, trading, treasure-house, treasury, vault