Support for David Cameron's party rises four points to 36 per cent in latest Populus poll.
Latest ComRes poll puts Tories down two to 32 per cent, just a point ahead of the Lib Dems.
Latest YouGov poll suggests a hung parliament remains the most likely outcome of the election.
Latest polls put Lib Dems ahead of Labour and show little decline in support.
New YouGov poll suggests press attacks have not damaged Clegg as Lib Dem support rises to 29 per cen
Latest YouGov poll puts Tories five points ahead of Labour.
New poll puts the Conservatives eight points ahead of the Lib Dems.
Lib Dems up to 34 per cent in new poll, three points ahead of the Tories.
New YouGov poll puts the Tories two points ahead of the Lib Dems.
Dramatic increase in support continues as new YouGov poll puts the Lib Dems in first place.
New poll puts Lib Dems up 12 points to 32 per cent, ahead of the Tories.
Support for Lib Dems surges eight points to 30 per cent, just three points behind the Tories.
Poll bounce for Nick Clegg's party following first TV debate.
Tories down four points to 37 per cent in latest YouGov poll.
Latest YouGov poll suggests Tories will win a small majority at the election.
Latest Populus poll suggests hung parliament remains likely.
Conservatives just six points ahead of Labour in new YouGov and ICM polls.
New YouGov poll shows hung parliament remains likely.
Tories retain large lead over Labour but hung parliament cannot be ruled out.
Tory lead rises to ten points in new YouGov poll, large enough to give Cameron a majority.
David Cameron set to win a small majority, according to latest YouGov poll.
Tory lead cut to five points in latest YouGov poll and to seven in new Populus poll.
Conservative lead down two points in first poll since Gordon Brown called an election.
David Cameron on course to win a small majority, according to new YouGov poll.
New ICM poll suggests Labour could remain the single largest party after the election.
Latest YouGov poll suggests hung parliament remains likely.
Conservative lead up to seven points in latest YouGov poll.
Latest figures would leave the Tories 17 seats short of a majority.
Two Sunday newspaper polls put the Conservatives on 37 per cent.