Reason Morning Links: Obama Speaks on Health Care, Supreme Court Considers Political Speech Case, Blogging Troops

– Obama pushes health care plan in speech to join session of Congress tonight.

– Supreme Court hears arguments in Hillary: The Movie free speech case today; may roll back restrictions on corporate contributions to political campaigns.

– U.S. "very concerned" that Iran is nearing its first nuclear weapon.

– European powers call for a major U.N. conference on the future of Afghanistan.

– Pentagon cautiously allows U.S. troops to blog.