I think that "a middle ground" sums it up neatly. Middle ground means what you want it to mean. I can define middle ground quite easily in terms of my values. But that's just me. I recall someone saying that Thatcher occupied the middle ground. Well, in terms of my middle ground, that makes two lots of middle ground seriously at odds with each other. I'm extremely suspicious of anyone who claims to have the middle ground. When you look at Vince and the Libdems, serial claimants of the middle ground, then consider the disreputable way the party has behaved since 2010, I think it's right to be suspicious. And suspicions are heightened when an incredibly weak party with an incredibly weak leader suggests that he can muster like-minded people around him in the middle ground...