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“It’s nice to see Paul Ryan back here in Congress. It will be even nicer to see him back here as a full-time member in January,” said Sen. Charles E. Schumer, New York Democrat.

When Mr. Ryan walked into the House chamber, Republicans and several Democrats applauded him.

Rep. Charles B. Rangel, New York Democrat, was particularly vocal and even went over to join what turned into a receiving line for the vice presidential nominee.

Mr. Ryan stayed only long enough to vote for the spending bill and against Democratic alternatives and then departed.