Caroline Lucas is the Green Party's best hope at the 2015 general election. Lucas, the party's former leader, became the first ever Green MP in 2010 when she was elected in the Brighton Pavilion constituency.
General election 2015: Brighton Pavilion constituency candidates
Chris Bowers - Liberal Democrats
Nigel Carter - Ukip
Caroline Lucas - Green
Clarence Mitchell - Conservative
Howard Pilott - Socialist
Purna Sen - Labour
Nick Yeomans - Independent
Now she is battling to keep the seat but faces a number of challenges – not least from her own local party, which has had a controversial few years in control of the council.
As part of a series on marginal constituencies in the UK, IBTimes UK travelled to Brighton Pavilion to take a look at what is going on in the close-fought election campaign.