A YouGov survey for The Times on Friday (June 23) found 35 percent of respondents thought the Labour leader would make a better leader than the Conservative Party's current leader.
When you look at the YouGov poll showing that more people want Corbyn to be Prime Minister than Theresa May. https://t.co/ptPDW6m9aZ— George Aylett (@GeorgeAylett) 22 June 2017
That compared with only 34 percent who believed the incumbent would do a better job.
It marks a remarkable plunge in popularity for the former Home Secretary, who took over from David Cameron in 2016 after he fell on his sword following the Brexit referendum result.
Although Mrs. May was a Remainer during the referendum campaign, she threw herself enthusiastically into the Brexit camp and went so far as to say "no deal was better than a bad deal."
But her support for a "hard Brexit" was one of many positions she took during an inept general election campaign which showed how out of touch she was with the country.
In April, she had a net favorability rating with YouGov of plus 10 but that plunged, after the release of the Conservative manifesto, to minus 5.
A few days before the general election she had a popularity rating of 43 percent with YouGov, compared with 32 percent for Mr. Corbyn.
But he has now overtaken her, with another 30 percent of voters unsure who would make the better prime minister.
Mrs. May's popularity has been in free fall since the election, when she failed to get the majority in parliament that she needed to rule, and was forced to go with a begging bowl to the Democratic Unionist Party, from Northern Ireland.
Their 10 seats would give her a small majority but even that has been a struggle as negotiations with the DUP dragging on even after the Queen's Speech.
Mrs. May has appeared weak, indecisive and even cowardly, when she refused to meet survivors of the Grenfell Tower fire at the weekend.
Although the lion's share of the blame for the fire and its aftermath has gone to Conservative-controlled Kensington and Chelsea Council, the government has not escaped unscathed.
Mrs. May and her ministers have repeatedly failed to explain why a fire safety review which was ordered after the 2009 Lakanal House tower block blaze in south London, which killed six people, had been put on the back burner.
Ironically the man responsible for it, Gavin Barwell, the housing minister, lost his seat at the general election only to boomerang back when he was appointed at Mrs. May's senior aide after she fired her hapless advisers, Nick Timothy and Fiona Hill.
Can anyone explain why Theresa May still has Gavin Barwell as chief of staff? The Grenfell trail of ineptitude leads to the heart of No 10.— Murray Foote (@murrayf00te) June 19, 2017
Mrs. May's performance has been so bad that there has been speculation she will be replaced by the end of the summer.
Friday's poll also asked voters for their views on Brexit.
The number of people who felt that leaving the European Union was wrong (45 percent) now outnumbered the number of people who still feel it is a good idea (44 percent).
When asked to choose, 58 percent of voters preferred "British businesses having free access to trade with the EU, but Britain having to allow EU citizens the right to live and work in Britain" while 42 percent would rather "Britain having full control over immigration from Europe, but British businesses no longer having access to free trade with the EU."
Brexit negotiations began on June 19 and 34 percent of voters in the YouGov poll trusted the Tories with the Brexit negotiations, compared with only 20 percent for Labour.