3 candidates for US President?

CNN is reporting that Alan Greenspan is predicting that there will be a third candidate for President in one of the next two elections. He thinks this because the Democratic party promotes very liberal candidates, and the Republican party promotes very conservative candidates, leaving a lot of people in the center without representation. This leaves room for a well-financed, third party candidate to run in the center. It doesn't say whether he thinks that candidate will win.

I think that a moderate candidate would be a good thing, and I would probably vote for such a person.

日本語：
CNN によるとアラン・グリーンスパンは２００８年か２０１２年に大統領候補者３人を予測するそうだ。
民主党はとてもリベラル派の人を指名で、共和党はとても保守的派の人を指名すると思っているから,
中道派の資金力のある大統領候補者の余地がある。 その人は当選するそうじゃない。

私は中道派の大統領候補者がいるのはいい。多分その人を投票するだろう。