Clinton and Third Person Speech

As I watched Hillary Clinton's victory speech on Tuesday night, I was struck by how often she uses the third person to speak to Americans. Personally, I feel that using "we" -- which is what Senator Obama often does -- would be more effective. It is more personal, communal, and addresses the listener directly. Consider the following (transcript):

• "More and more people have joined this campaign and millions of Americans haven't spoken yet. In states like Pennsylvania and so many others people are watching this historic campaign, and they want their turn to help make history. They want their voices to count. And they should. They should be heard."
• "Americans don't need more promises. They’ve heard plenty of speeches. They deserve solutions and they deserve them now."