Mainstream Conservatism can be defined as the beliefs shared by most Conservative members, in common with the public. Euroscepticism, for example, can scarcely be found in the House of Commons, yet only a third of Brits think that EU membership is "a good thing". So being Eurosceptic might mean one is on the fringe of Westminster opinion (or that of the metropolitan elite in general), but pretty well aligned with general public opinion. Newspapers (and magazines) are read regularly by a minority of people: they tend to reflect the views of their target readers. Liberal Conservatism may be more in tune with the media, but this is not the same as the vox populi.
Liberal Conservatives tend to have spent more of their lives in Westminster, imbibing its values and learning a new version of the 'middle ground' – ie, a mid-point between the skewed spectrum of political opinion represented in the House of Commons. This is not much shared by the new MPs (half of the parliamentary party) who are fresh in from the real world, and feel a greater loyalty to their constituents than a government whose agenda is different to the one on which they stood for office.
The beliefs of Mainstream Conservatives? Tough on crime, sceptical about closing prisons, hawkish on defence, anxious about immigration and hostile to the European Union. The Liberal Conservatives like the coalition because it cements their power in the party – and, indeed, many want the coalition to last for another five years. Mainstream Conservatives look forward to the time where they can dump the Lib Dems, and many say so in terms.
This distinction between these two groups mirrors, pretty much, that which Sir Keith Joseph famously drew between the 'middle ground' and the 'common ground'. I'd normally quote him directly, but a politician subsequently put it even better:
"You reach the middle ground as an exercise in political positioning, splitting the difference between the parties. You seek the common ground through a process of profound political inquiry, understanding the deepest values of the British people. Seeking the middle ground, you define yourself by the position of your opponents and you lose any connection between your policies and your principles. That is what happened to Tony Blair. The real task of politics is to apply your principles and your values to the issues which most concern people."
Interestingly, the new MPs have no interest in (and are pretty baffled by) the Tory Wars and its terminology. Calling oneself a 'moderniser' now is like a Labour MP calling oneself a Kinnockite: it was right for a certain period of history, but politics moves on rapidly. Trying to apply the Blair tactics to the Tories was never going to work: it was playing by a 1997-00 gameplan, when conditions had shifted to look more like 1979-1982. New Tory MPs (with the exceptions of those who were advisers/combatants during the Tory Wars and have, ergo, been shaped by it) are suspicious of this Blair-style 'Triangulation'. Cameron himself has denounced it as "the process of working out what you should say by reference to your own past position, and your opponent's current position". As Cameron says, this is political fudge: the electorate can smell it a mile off, and they tend not to vote for it.
So Cameron needs to keep this balance in his party. This means giving Gove and IDS all possible support from No.10: their agendas are, right now, the glue which keeps the Tory coalition together. As James argues in the Mail on Sunday today, Cameron may have to eject Ken Clarke. The Tory leader has spoken against the deception of the "centre ground" clearly enough to demonstrate that he's not taken in by it.