U.S. House Speaker John Boehner kisses House Minority Leader Nancy Pelosi, as he holds the gavel after being re-elected speaker on the House floor at the U.S. Capitol in WashingtonRepublicans took full control of Congress on Tuesday, but — even on a day of happy ceremony — GOP leaders were reminded of the limits of their power, first by a veto threat from the president and then by a historic rebellion by conservatives in the House. In the Senate, Mitch McConnell (Ky.) was sworn in as majority leader, giving Republicans control of both houses of Congress for the first time in eight years. That was the day’s most important shift, but it was anticlimactic: McConnell spoke only briefly, conscious that he was holding up the post-oath receptions. “Tomorrow, it’s back to work,” he said. “I yield the floor.” The day’s real drama was, instead, in the House. There, Republican control was not in doubt: After last fall’s electoral victories, the GOP has 246 of the chamber’s 435 seats, its largest majority since the 1940s. More