A coalition of anti-abortion groups performed a string of live ultrasounds on stage in the Congressional Auditorium Thursday morning to kick off its national "Voices From the Womb" tour, which uses sonograms as a political tool to convert people into opposing abortion.The campaign invited all 535 members of Congress to witness pregnant women stepping up on stage, one after another, to have their live ultrasounds projected onto a giant screen and described for the audience.