Stan Greenberg backed the pro-Remain party for their clarity on Brexit

A political strategist who worked for Bill Clinton and Tony Blair has switched sides to help the Liberal Democrats prepare for the next election.

Stan Greenberg said he was a Labour supporter “in my bones”, but accused Jeremy Corbyn of “dithering” over Brexit. The veteran pollster, 74, last week met a group of senior Liberal Democrats in London. The pro-Remain party is keen to capitalise on its success in the European elections.

Mr Greenberg said he had thought “very long and hard” about working with the Lib Dems.

He “deeply resented” the Tory-Lib Dem coalition government’s policy of austerity, he said. When Sir Nick Clegg entered government with David Cameron in 2010, “I was done with them, I felt so betrayed. But then they were