(VIDEO AT LINK) While addressing college students in Richmond, VA, President Obama was surprised to learn that schools use trailers, also called 'modular buildings' or 'modular classrooms.' During his visit Obama said he was approached by an educator who mentioned she teaches in a trailer. Obama did not mention that the teacher had a problem with her situation, but he made it clear this was unacceptable. "I just -- in the back, I was taking some photos with folks who had helped out to organize this event, and there was a young lady who is a teacher. And she said,...