Parties can’t change in four weeks what they’ve failed to change in five years

My most recent constituency polling has found an increase in support for Labour and the Conservatives – and, in their own battlegrounds, the Liberal Democrats – while the UKIP share has drifted down since last year. Even so, neither of the main parties has established a clear overall lead, either in national polling or in the marginals. So while the evidence is that voters may be focusing more on the parties capable of forming a government, they are not finding the choice becoming any easier or more palatable.