Surprising Jump in Tax Revenues Curbs U.S. Deficit By EDMUND L. ANDREWS WASHINGTON, July 8 — An unexpectedly steep rise in tax revenues from corporations and the wealthy is driving down the budget deficit this year, even though spending has climbed sharply because of the war in Iraq and the cost of hurricane relief. On Tuesday, White House officials are expected to announce that the tax receipts will be about $250 billion above last year's levels and that the deficit will be about $100 billion less than what they projected six months ago. The rising tide in tax payments has...