WASHINGTON, May 4 — The Senate approved a $109 billion spending bill today to pay for the Iraq war and Gulf Coast recovery, ignoring a veto threat from President Bush and setting the stage for bitter negotiations with the House. The Senate's 78-to-20 approval of the bill at a level far in excess of the president's request put the Senate at odds with the House, where the Republican leadership has taken an increasingly hard line against add-ons in the measure. "The House will not take up an emergency supplemental spending bill for Katrina and the war in Iraq that spends...