"closing the arena because of fire regulations" line -- shutting dozens of people out around half an hour ago -- was a secret service lock-down. AP has been looking at the facts behind some of the speeches tonight, including claims from Nancy Pelosi and Rep Steve Israel that Republicans would end the Medicare guarantee, deeming them both to be on"shaky ground". Bill Clinton is such a big draw that more than 90 minutes before he is due to speak, the fire marshals have declared the arena to be at capacity and closed the doors, writes Ewen Macaskill. Latecomers, including some frustrated journalists, are stuck outside. Chatting to delegates crammed on to the arena floor, there is a lot of enthusiasm for Clinton, maybe the best political orator in the US today, and Barack Obama, maybe the second, tomorrow. T.E. Austin, wearing a giant red, white and blue top hat, said he was looking for an "incredible speech" from Clinton. He had heard him when he was governor of Arkansas, as president and since he had left the White House. Austin, 64, a retired city planner from Durham, North Carolina, also has high expectations of Obama, who is "good too at getting a crowd worked up". He had not heard the president live since the inauguration in 2009. He would not say who was best. "They have different speaking styles but are both good at revving people up." Benita Veliz , who was brought to America from Mexico by her undocumented