A reshuffling of President Barack Obama's staff looks all but certain after Tuesday's congressional elections, which were likely to bring humbling losses to his Democratic party and could add to pressure on him to reboot his presidency.

Forecasters said that Republicans, who have made Obama's unpopularity a top issue in the elections, were in a strong position to take the Senate and expand their majority in the House.

But current and former White House aides have said that even if those predictions prove correct, Obama will likely resist calls to clean house for the final two years of his administration, a departure from the dramatic makeovers quickly ordered by many of his predecessors after similar setbacks at the ballot box.