I guess I've always looked at moderate as more of a collection of views, rather than being moderate on everything (which is, literally, a Moderate Hero). If a Democratic Senator is staunchly pro-life and against gun control but extremely liberal on issues like taxation and regulation, I don't think it's fair to call him or her a left-winger with a few conservative positions, especially when there are so many hacks in Washington who simply share every single view of their party's platform.
Why is it so many people seem to be able to fit in a table of views anyway? I find it odd how it seems like almost everyone is in a box and very rarely leaves that box. Indeed it is true of elected officials, but it is also true of many voters. If the candidates broke out of that box more, it would be far easier for me to find candidates to support.