PA•GETTY Nigel Farage is more trusted than the Prime Minister on the EU, a new poll revealed

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In a YouGov survey, 23 per cent of those asked said they trusted the Ukip leader on the EU and the upcoming referendum, with only 20 per cent believing the Prime Minister. Mr Farage’s trust ratings rose four per cent in a fortnight while Mr Cameron’s fell by one point.

Boris Johnson saw his trust level rise by six points to 32 per cent over the same period, despite a row sparked by his highlighting of US President Barack Obama’s ‘part-Kenyan’ background. The poll revealed the American leader is the most trusted politician on the EU referendum (35 per cent) but there are signs President Obama’s controversial intervention in the Brexit debate last week may have backfired. In a joint press conference with Mr Cameron last Friday, the US leader had warned Britain would be “at the back of the queue” for a free trade deal with America if it quit the EU on June 23. But in the YouGov poll, conducted on Monday and Tuesday, 42 per cent said they would vote for Brexit - up by three points in two weeks - while 41 per cent said they wanted Britain to remain in the EU, up by one point. The number of ‘don’t know’ answers was down three points to 13 per cent, while four per cent said they would not vote in the referendum (down one point). With the ‘don’t know’ answers removed, 51 per cent backed Brexit compared to 49 per cent for ‘Remain’ - marking a switch from the previous poll two weeks ago.

It appears that Britain’s older voters are starting to become firmer in their opinions with fewer undecided. Saga’s director of communications Paul Green

On the Vote Leave campaign’s key messages on the NHS and immigration, 35 per cent of respondents agreed that leaving the EU would be good for the NHS while only 17 per cent thought it would be bad. Nearly half (48 per cent) believed that leaving the EU would mean a reduction in the three million people the Office for National Statistics has predicted will come to Britain by 2030. The YouGov survey is the second recent poll to show the Brexit campaign in the lead, which has been said to signal a “hardening of resolve” among Leave supporters. Earlier this week, pollsters ICM found that 46 per cent of those quizzed want the UK to leave the EU while 44 per cent want to stay. A further poll of more than 8,000 over-50s by Saga suggested support for Brexit is growing among older voters.

The pros and cons of Brexit Fri, February 26, 2016 The pros and cons of Brexit. Play slideshow Getty Images 1 of 12 Pros and cons of Brexit