People in the US have been voting in primary elections, to choose Democrat and Republican candidates to contest the November mid-terms.
The results have added weight to the theory that the Tea Party movement is the new political force in the land.
The Tea Party is a conservative, anti-establishment movement which is critical of big-spending big government.
They have been backing some candidates, almost exclusively Republican, in these primaries.
Sal Russo is a key right-wing strategist and one of the main drivers behind the Tea Party.
First broadcast 19 May 2010
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