Yahoo News Nearly half of all Labour voters prepared to desert the party as they lose both leave and remain support
Nearly half of Labourvoters are prepared to desert the party putting the Conservatives on course for an even bigger victory than forecast, a poll has found.
Yougov said that 48 per cent of Labour's voters are either planning to switch their allegiance to another party or are undecided about whether to back Jeremy Corbyn.
The EU referendum had caused a "significant realignment" in British politics with Labour facing a "dramatic" drop in its support as Leave voters back the Tories and Remain voters back the Liberal Democrats.
In contrast seven in 10 of those who voted to back the Conservatives at the last election said they will support Theresa May in June.
The party is also picking up significant numbers of Leave voters from Ukip, the poll suggests. The Liberal Democrats have seen a "modest" increase in support as they have picked up Remain voters from the Conservatives and Labour.
Who voter for each party in 2015
The poll also finds that Ukip is struggling because its voters are backing the Conservatives and the party has failed to pick iup votes elsewhere.
Yougov added, however, that there are significantly more undecided voters than there were during the last election.
It said: "This is because many people thought they would have a few years to make up their minds about who to support.
"So great are the numbers of undecideds that more people currently tell us they are don’t know who they will support than say they plan to vote Labour.
"How and if these voters break over the coming weeks will determine the final result, especially in marginal constituencies.
"Were they to drift back to the party they voted for last time, this would disproportionately help Labour (as that is where many of them have come from).
"However if they start to move towards the Conservatives, just like other voters have, we could be heading for an even bigger Tory victory than many currently anticipate."
