The Ipsos-MORI survey for the Evening Standard shows a leap in support for the Tories if London's mayor replaced David Cameron as leader.
Boris Johnson has put an end to years of speculation by confirming he will try to run as an MP in 2015, meaning he could be PM by 2020.
David Cameron and Boris Johnson pulled over their car this morning after noticing a woman who had collapsed on the street in Harrow.
More than half of voters in a London constituency which is seen as a target for Boris Johnson would vote for him if he chose to stand there in 2015, according to a poll.
A survey conducted in Uxbridge and South Ruislip after the London Mayor finally confirmed his desire to return to the Commons showed he could significantly boost Tory support.
But a third of those who backed him also said he should quit City Hall if elected - despite Mr Johnson insisting he could see out the final year of his term.
The poll of 1,000 people in the seat being vacated by former deputy chief whip John Randall was carried out for Tory donor and former party vice chairman Lord Ashcroft.
Two in five British people wish more politicians were like Boris Johnson, a ComRes poll for ITV News has found.
Some 28% of Britons believe Mr Johnson - who recently announced his intention to return to parliament - would make a better Prime Minister than David Cameron while 44% think he would be better-suited to the role than Ed Miliband.
More Britons think the Mayor of London is weirder than any of the four main party leaders, with a third saying Mr Johnson is not a serious politician.
But 35% said they would like to see Boris Johnson representing the UK on the global stage.
He was also found to be the second most trusted politician on the economy behind David Cameron, according to the poll of 2,031 British adults.
Nick Clegg has called Boris Johnson a "conventional" politician who "treats his political ambition a bit like he treats his hair."
Clegg said the Mayor of London, who announced his intention to stand at the next General Election, liked to pretend he did not care about his appearance or career - but was actually "fixated" with them.
"The thing about Boris Johnson is despite all the kind of clumsiness and bumbliness, he's actually a really, really ambitious politician," the Deputy Prime Minister said on his regular LBC radio phone in.
"He wants everyone to think that he doesn't really care, but he actually really, really does care."
Boris Johnson could become Business Secretary if the Conservatives win next year's general election, reports suggest.
Following the Johnson's announcement that he will seek to return to parliament next year, the Daily Telegraph report that he could fill the role of Business Secretary when his term as London Mayor ends in 2016.
Mr Johnson would be given an "over-arching role" in charge of infrastructure, the newspaper report.
David Cameron has welcomed Johnson's announcement as "great news", hailing the Mayor of London as one of his "star players".
Reaction to Boris Johnson's announcement that he intends to stand for parliament features on a selection of tomorrow's newspaper front pages.
The Daily Mail claim the Boris Johnson "bandwagon was now in full swing" as speculation mounted over the London Mayor's leadership ambitions.
The Guardian suggests the Conservative Party were divided over Johnson's potential return to the Commons and its implications for the party leadership.
The Deputy Chair of the Liberal Democrats has accused Boris Johnson of "extraordinary arrogance" after he announced plans to run for Parliament in 2015.
Sir Malcolm Bruce told ITV News it looked as though the Mayor of London was an "opportunist" who thought he could "walk in and out of Parliament" as he pleased.
Labour's Tessa Jowell, who is seen as a frontrunner for the party's London mayoral candidacy, has attacked Boris Johnson over his plans to stay on as Mayor even he is elected as an MP.
Londoners need representation by their Mayor day-in day-out. Transport, homes or jobs, Londoners' challenges deserve undivided attention.
Mr Johnson announced earlier that he planned to run for Parliament in 2015 but also remain as London mayor until 2016.
Former Cabinet minister Ms Jowell has already said she is standing down from Parliament in 2015 and is believed to be targeting a run at the mayoralty.
She has previously said that “were I Mayor of London, I wouldn’t be like Boris, certainly not”.
Nick Clegg has launched a scathing attack on Boris Johnson over the Mayor of London's speech on the EU today.
The Deputy Prime Minister said threats to "flounce out" of the union were "deeply irresponsible" and motivated by Mr Johnson's personal ambitions.
The comment about Mr Johnson's ambitions came after he used a speech about Europe to announce his intention to stand for Parliament in 2015.
“I think this speech is more to do with Boris Johnson’s political ambitions rather than what is right for the United Kingdom," the Lib Dem leader said.
"I think it is deeply irresponsible to suggest that we can flounce out of the European Union and I don’t think it's the way that you get the reform," Mr Clegg added.
Boris Johnson has said it was "largely" David Cameron's idea for him to run as an MP at next year's general election.
The Mayor of London told ITV News Deputy Political Editor Chris Ship that he made the announcement today because people were "fed up" of "pussyfooting around" about his future.
Discussing the Prime Minister's views, Mr Johnson claimed it was "largely at his instigation" that he had decided to try to return to Parliament.