Artwork based on anti-war campaigner Brian Haw has made the shortlist for the 2007 Turner Prize.
Mark Wallinger recreated Haw's Parliament Square protest camp for his State Britain exhibition.
Other shortlisted artists this year include photographer and film-maker Zarina Bhimji and sculptor and photographer Nathan Coley.
Mike Nelson, who was nominated in 2001, has also been selected for his large installation work.
Wallinger was shortlisted in for the Turner Prize in 1995 and one of his sculptures, Ecce Homo, stood on the vacant plinth in Trafalgar Square in 1999.
Bhimji has been shortlisted for her photographs of Uganda, from where she was exiled under Idi Amin.
Nelson will be judged on his Double coop displacement installation, which features a structure made of wood and chicken wire.
Coley specialises in cardboard models of religious buildings, painted in gaudy stripes similar to a circus big top.
He has been selected for works displayed on the Isle of Bute, in Santiago de Compostela, Spain, and in Belgrade, Serbia.
Christoph Grunenberg, director of Tate Liverpool and chairman of the Turner Prize 2007 jury, said: "While the artists are nominated on the basis of their individual presentations over the past 12 month, they do share a number of concerns.
"Political issues figure prominently in all their work, they explore the lessons and legacies of history and the representation of collective and personal memory. I am looking forward to a powerful exhibition at Tate Liverpool this autumn."
The prize will be presented on 3 December at the Tate Gallery in Liverpool, ahead of the city becoming the European Capital of Culture in 2008.
Works by the four nominated artists will be exhibited in October at Tate Liverpool's Albert Dock gallery.
The £25,000 was won last year by the German painter Tomma Abts.
The prize is noted for causing debate over its winners' artistic merit. The 2005 winner was Simon Starling, who dismantled a shed, made it into a boat, then turned it back into a shed again.