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No trace of the Malaysia Airlines Boeing 777-200ER has been found since it vanished on March 8 with 239 people on board, but investigators believe it was diverted by someone who knew how to switch off its communications and tracking systems. Satellite data revealed by Malaysia's prime minister on Saturday suggests the plane could be anywhere in either of two arcs: one stretching from northern Thailand to the border of Kazakhstan and Turkmenistan, or a southern arc heading from Indonesia to the vast southern Indian Ocean. A source familiar with official U.S. assessments said it was thought most likely the plane had headed south into the Indian Ocean, where it would presumably have run out of fuel and crashed. As authorities desperately try to re-focus the multinational search, India said it was suspending operations around island chains northwest of the Malay Peninsula, at the request of Malaysian officials.

By Steve Holland and Thomas Ferraro WASHINGTON (Reuters) - President Barack Obama and his Democrats face the challenge of limiting fallout from Obamacare and drumming up voter enthusiasm in the November congressional elections, problem areas exposed by the loss of a Florida candidate who had led in the polls. The defeat of Democrat Alex Sink by Republican David Jolly in a special election last Tuesday has raised anxiety levels for Democrats as they struggle to hold on to control of the Senate in November and pick up seats in the Republican-held House of Representatives. The Florida race reflected turnout concerns, as Sink had been leading in the polls in the days ahead of the election. "We need to think about how to energize our base." A focus simply on turnout, however, could distract party leaders from recognizing the dangers presented by the president's healthcare law and, with his approval rating mired in the mid-40s, his relative unpopularity.