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The US has been holding mid-term elections, which decide the balance of power in Congress over the next two years. The Republicans made sweeping gains as they won control of the House of Representatives, but the Democrats retained a slim majority in the Senate.

What do the results mean for President Barack Obama?

How big are Republican gains?

What was behind the Democrat losses?

What will happen to President Obama's agenda?

What about legislation that's already been passed?

Who was being elected?

Does the president's party normally do badly in mid-terms?

Why not elect everybody at the same time?