I'd rather not elect a centrist. We already have one (if not a leftist) in George W Bush.
Now, I'm certainly open to a more libertarian candidate who supports less government.
This is true. Anyone who calls Bush a 'conservative', at least on economics, needs to have their eyes checked.
What we need is a candidate who combines an aggressive foreign policy with true fiscal responsibility (cutting where needed, disapproving of pork, etc) on the domestic side, who leaves social issues for the most part to the states. Too bad such a person would be unelectable even if nominated.