My definition of a moderate:
A moderate is someone who "leaves the books alone". That is, prefers to keep things the way they are without major modification. This applies to current Supreme Court decisions and would not include a gay marriage ammendment. A moderate would look to balance spending and taxation. A moderate would create a strong national defense that is both effective AND economical. A moderate would rely on alliances to solve world issues while keeping America's foreign clout. A moderate would try and run the country like a business, making sure everything functions smoothly both here and abroad while allowing personal freedoms in the same manner as your boss at work allows personal freedoms.
This last part is how I look at the government. If my boss told me what I could and couldn't do in my time outside of work (ie sexual partners etc.) I would feel very offended, and rightly so. The government, under a moderate, should take the same direction. Leave moral issues to the individual. A moderate would answer the Pro-Lifers by asking them to create a society where a women no longer feel it necessary to have an abortion. A moderate would create a society where all people feel safe in public regardless of worldview or sexual orientation. Does this type of moderate exist? If he or she does exist they probably wouldn't be elected president, but I wish they would be elected.