Today’s space conference, including Obama’s speech, will be shown on NASA TV. Here’s the information (copied and pasted from this site):

NASA will hold a conference following President Obama’s remarks about the bold new course the administration is charting for NASA and the future of U.S. leadership in human spaceflight on Thursday, April 15, at the Kennedy Space Center in Florida. A diverse group of senior officials, space leaders, academic experts, industry leaders and others who have specific expertise or interests related to the topics of discussion will attend the conference and participate in four concurrent sessions on different aspects of the President’s new direction for NASA.

Additional Information: › President Obama’s Visit | › Space Conference

Where and When to Watch:

• Live Streaming High Definition Video of President Barack Obama’s visit to NASA’s Kennedy Space Center will be available on this page, beginning at approximately 1:30 p.m. EDT. The President is scheduled to speak at 2:40 p.m. EDT. It will also be available in standard definition on the regular NASA TV page.
• The opening session of the NASA Space Conference, starting at approximately 3:45 p.m. EDT, will be streamed in standard definition on this page and on the regular NASA TV page.
• Four concurrent breakout sessions, beginning at approximately 4:25 p.m. EDT, will be streamed in standard definition on this page.
• The closing session of the NASA Space Conference, starting at approximately 5:40 p.m. EDT, will be streamed in standard definition on this page and on the regular NASA TV page.