Considering a Bush appointee supported by Rick Santorum overturned PA's same-sex marriage ban, this way of looking at the courts is a little superficial. Makes sense since we use the word "makeup." 
Well, there are always judges that betray their appointers' expectations. Remember what Eisenhower said about nominating Earl Warren? That doesn't mean the party of the President who nominated a judge isn't a good predictor of their views.
Republicans seem to be doing much worse than Democrats at this over the last few decades. It's been a long time since a Democrat-appointed judge betrayed them on a hot-button social issue.
