Many Congress members' tweets, most of them from Democrats, expressed support for the president's decision. "Victory!" wrote Rep. Barbara Lee (D.-Calif.). "I am so pleased," wrote Lois Capps (D.-Calif.). "So glad," wrote Sen. Barbara Boxer (D.-Calif.).
Others took the opportunity to spin the conversation toward other interests. Rep. Ed Markey (D.-Mass.) tweeted,"Let's thank heroes returning from #Iraq by passing Obama #jobsnow plan so they get help finding good jobs at home."
Few Republicans reacted to the news on Twitter, but two of them -- Sen. Lindsey Graham (R.-S.C.) and Sen. John McCain (R.-Ariz.) -- didn't mince words.
"I hope I am wrong and the President is right, but I fear this decision has set in motion events that will come back to haunt our country," tweeted Graham. "I feel all we have worked for, fought for, and sacrificed for is very much in jeopardy by today's announcement."
McCain posted, "Today marks a harmful and sad setback for the United States in the world."
Republican Rep. Randy Neugebauer of Texas took a different approach.
"What do you think of this?" he asked his 4,000 followers.