Armed Liberal at the Winds of Change ( http://www.windsofchange.net/ ) blog wrote an outstanding acceptance speech in the role of the Democratic challenger for President. I completely recommend you read it. Also always worth checking there is the Iraq update page.
I would share most of the thinking. My top three priorities for any incoming admistration:
1. The spreading war against Islamist extremism. ( It is clearly much more that a war against Al Qaeda terrorists).
2. The insolvency of Social Security and the astounding pressure coming on budgets from the aging of America.
3. Making first quality healthcare available to every U.S. citizen without creating some awful, bureacratic, socialist style system.
I can post for hours on any of these - and probably will. If you have thoughts on the priorities, please comment.