Mark Steyn, in the midst of an otherwise unremarkable column on politics on some obscure continent (Europe?) makes this observation:
In a functioning party system, you’re never going to agree with your party on everything. You might, for example, be opposed to wind farms or in favour of toppling Robert Mugabe. But, even if you are, it’s unlikely to be the big political priority in your life. So you vote on the economy and Iraq and healthcare, and accept there’ll be a few disagreements by the time we get to page 73 of the manifesto. That’s why parties like to talk about themselves as “big tents”.