The UK Independence Party had its best ever showing in a by-election this week, in Rotherham. This is the second time the party has come second in a by-election. These are only two by-elections but does their rise point to something more than public disenchantment with the main parties' take on the EU? Ipsos Mori chief Ben Page, former home secretary Charles Clarke and Sheila Lawlor, director of think-tank Politeia analyse the results.

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