The Capitol building in Washington DC
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What to look out for as the US mid-term results come in

Americans are voting in the mid-term elections to decide who controls both houses of congress.

However the results also have implications for the 2016 presidential race, and give an indication of the current political climate in the US.

Katty Kay in Washington explains what to look out for as the results come in.

Go to next video: US mid-terms: Senate races to watch