Labour is enjoying the lead in three new polls, with one indicating voters believe Ed Miliband is performing better than David Cameron.
A Survation poll for the Daily Mirror has Labour climbing to a four-point lead over the Tories.
It put Labour on 35%, two points up on last week, while the Conservatives were on 31%, dropping by one point.
Panelbase has Labour up four points to 37% and the Tories falling two to 31%, while a TNS Omnibus survey shows Labour up one point to 33% and the Conservatives down three to 30%.
But ComRes research for ITV and the Daily Mail suggested the race was too close to call, putting the Tories on 34% and Labour on 33%.
However, that compared to a four-point deficit for Labour at the start of the campaign.
The Survation poll also put Mr Miliband's approval rating higher than the Prime Minister for the first time in Survation's polling history.
The gap between those saying Mr Miliband was doing a good and bad job was +3.2 points to Mr Cameron's +2.3.
But the Labour leader still trails the Prime Minister in the ratings for who would be best to lead the country after the General Election - Mr Miliband is on 25% to Mr Cameron's 37%.
The survey also found Labour's pledge to abolish the non-dom tax status has received broad approval, with 59% in favour and 16% against.
The poll found the policy even had support from Tory voters.
The ComRes research also had some good news for the Lib Dems - they gained three points to draw level with UKIP on 12%.
Greens were down a point at 4%, according to the survey.
But the Greens were up two points to 4% in the Survation poll.
It found UKIP's support dropped three points to 15%, and the Lib Dems and SNP were unchanged on 9% and 5% respectively.
Panelbase also had UKIP down, dropping one point to 16%. The Lib Dems were up one on 8% and the Greens dropped one to 4%.
In the TNS Omnibus survey, UKIP went up three to 19%, the Lib Dems were unchanged on 8%, the Greens down one on 4% and others at 7%.