R2P - Responsibility to Protect.
OK, that isn't really clear. So, go here, and find out more about it.
Think the above source is biased? Try reading the report from one of the groups promoting this doctrine.
What R2P is, is the outsourcing of our government's role in declaring war. No longer does the President have to make his case before Congress. He apparently can bypass them, and cite international coalitions - UN, the Arab League, any multinational NGO (non-governmental organization) - as the organization that has the authority to force American troops into battle.
In case that's not clear, I'm against it.
UPDATE: Here's 10 Things Libya Tells Us About Barack Obama and War