A poll to be published the day before the European elections suggests the battle for third place will be between the Green Party, the LibDems and UKIP.
In the new poll, conducted by ComRes, the Greens have overtaken the LibDems for the first time since 1989. The polling organisation suggests the Greens may be about to match their historic 1989 Euro-election vote of 15%.
The poll shows support for the different parties as follows:
Lib Dems: 14%
If the poll proves accurate, the Greens will probably win seats in the North West, Yorkshire and the Humber, West Midlands, East Midlands, South West and Eastern regions plus Scotland, as well as holding existing seats in London and the South East. The Greens may even scoop up a second seat in the South East, with Brighton councillor Keith Taylor joining party leader Caroline Lucas, who was first elected in 1999.
Last Sunday's Telegraph/ICM poll showed the Greens on 11%, ahead of UKIP nationally for the first time in the campaign. The Sunday Telegraph suggested that "the resurgent Greens" might win eight seats.
And in an earlier Green Party/YouGov poll, 34% of respondents said they would either definitely vote Green or consider voting Green if they knew more about the party.
Of course, voters are attracted by a party that's untainted by the current MPs' expenses trow, but it's not all protest vote.
I think our manifesto for a million jobs, aimed at tackling the recession and the climate crisis at the same time, has probably struck a chord with a lot of people.