Will the Midterms be a whitewash for the White House?

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Will the Midterms be a whitewash for the White House? What's Liz Truss's book really like? Should you be stockpiling gherkins? Who will be the MMP for Stockport? Matt Chorley brings you the who, what, where, why and when of British politics. If you've got urgent questions... then email Chorley@bbc.co.uk