Immigration advocates in and out of Congress are railing against those who voted for the stopgap spending bill Thursday despite promises from Democratic leaders that they would force action on the issue by the end of the year. Even before the Senate vote, a group of House Democrats burst into the office of Sen. Charles Schumer, D-N.Y., the Senate minority leader, demanding an explanation. Protesters shouting "Shame on Kaine!" briefly occupied the office of Sen. Tim Kaine, D-Va., who said he voted for the measure to prevent a partial government shutdown and protect federal employees.