Party on course to lose a third of the 57 seats it contested in parliament , critics say . Clegg labour party is fighting ' tooth and nail ' in a tenth of constituencies . Aides argue that even 30 seats would be enough to hold balance of power .
Party on course to lose a third of the 57 seats it won in 2010 , sources say . Clegg admits party is fighting 'tooth and nail ' in a tenth of constituencies . Aides think that even 30 seats could be enough to hold balance of power .