WASHINGTON (Reuters) - A lead Republican negotiator on an infrastructure deal on Sunday welcomed President Joe Biden's withdrawal of his threat to veto a $1.2 trillion bipartisan bill unless a separate Democratic spending plan also passes Congress. Ohio Senator Rob Portman said he and his fellow negotiators were "blindsided" by Biden's comments on Thursday after he and senators announced a rare bipartisan compromise on a measure to fix the nation's roads, bridges and ports. "I was very glad to see the president clarify his remarks because it was inconsistent with everything that we had been told al...