Primary results and political advertising The Democratic campaign for the nomination continues as neither Hillary Clinton nor Barack Obama secured enough delegates. The question some analysts are asking is how the messages of two campaigns will change in ads over the airwaves and the Internet.9:06 a.m.
Terence Samuel: senior correspondent for The American Prospect.
Dennis Goldford: professor of politics at Drake University in Des Moines.
Paul Freedman: associate professor of politics at the University of Virginia. He is co-author of the new book "Campaign Advertising and American Democracy."
Looking beyond the stars Astronomer Heidi Hammel is bringing galaxies and planets into closer view with her work on the new James Webb Telescope. Midmorning spotlights her expertise on outer planets like Neptune and Uranus, and experience with the Hubble Telescope.10:06 a.m.
Heidi Hammel: Heidi Hammel is senior research scientist at the Space Science Institute. She is helping to build the James Webb Space Telescope scheduled to launch in 2013.