WASHINGTON - ? The spending showdown for last year?s federal budget could end by tonight. President Obama has until midnight to sign the spending measure that the House and the Senate has approved. The spending measure keeps the government open and honors a deal worked out with Senate Democrats and Obama last week. The plan would cut a record $38 billion in federal spending. Republicans who voted against the bill say it does not include enough cuts. Now, Republicans are expected to push for major changes in Medicare and deep spending cuts.