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msnbc headquarters in new york city. we got a lot to get to this hour. first a community in mourning as michigan state university remembers three killed during a mass shooting monday. students still trying to process the violence. >> all of us are numb to the whole situation. we have lived this our entire lives. >> i'm still processing it. >> i honestly don't know if i can ever take a step foot into na union anymore. >> you see it on the news, but you never think it's going to be your school. >> and in fact, it is their school. we're learning more about the victims now as well, 20-ye...

Officials, for instance, that americans don't need to panic. there's a lot of pressure coming from capitol hill for the president to explain more to the american people including from some democrats, and so there is a discussion about when and where he might do this, but as you noted, there's concern that the information incomplete, that the president -- want to put the president out there when they don't have a lot of information. that is changing. we heard from administration officials yesterday, for instance, that the intelligence community is leaning towards the explanation of what some of...

He has to come out on that. he has to do the general electionsome primary opponents that worked. >> greta: nice to see you. and let the smearing begin. we don't know governor's choice yet. but the nasty attacks have started and super pacs, trashes people who will not be governor romney's vice presidential pick. but the super pac has a brand-new strategy, trash a lot of people, hopefully one of them will be his choice. abc news was the first to report on the super pack attack and abc news washington editor rick cline joins us. what is this super pac this? >> super pac is put together basically ...

He has to come out on that. he has to do the general electionsome primary opponents that worked. >> greta: nice to see you. and let the smearing begin. we don't know governor's choice yet. but the nasty attacks have started and super pacs, trashes people who will not be governor romney's vice presidential pick. but the super pac has a brand-new strategy, trash a lot of people, hopefully one of them will be his choice. abc news was the first to report on the super pack attack and abc news washington editor rick cline joins us. what is this super pac this? >> super pac is put together basically ...