Are wealthy white suburbanites generally socially liberal or conservative?

[Cassandra]

That depends on whether they are religious.

EDIT:

This, though I'm not convinced that the GOP is really significantly less middle class now than it was ten years ago.

Religion is the primary determinant and the tendency for religiosity among societal elites tends to wane over time, that includes the Middle Class suburbs. As religion has shifted more down market so too has the GOP.