craig boswell reports from washington. among the serious issues, there's also a lot of pomp and circumstance. >> reporter: president obama welcomed chinese president hu gin to you to the white house with the full hon -- hu jintao to the white house with the full honors. the two countries have a huge stake in the economic state. >> nations including our own would be more prosperous and secure when we wok together. >> reporter: but cooperation means finding common ground on a range of issues. huh has been pressured to -- hu has been pressured to back north korea. >> nations are more successful and the world is more just when the rights and responsibilities of all nations and all people are upheld. >> reporter: china is also america's biggest lender and the chinese government has been criticized for manipulating the currency to give it a trade advantage. >> china will have influence in terms of how major global issues are resolved. the economy being significant, the climate being another. >> reporter: president obama hosts a

reporter craig boswell has more from washington in this live report. craig?reporter: good evening to you, ken. yes, flowers are being placed outside of representative gabrielle giffords's office. president fbi said the fbi director robert mueller has been sent to arizona to personally coordinate the investigation. and capitol police still remain on what is being described as a high level of readiness. >> this is a tragedy for arizona and a tragedy for our entire country. >> reporter: president obama addressing the nation this afternoon from the white house just hours after representative gabrielle giffords, a republican turned democrat from arizona was shot outside a grocery store in tucson. police say the alleged shooter is 22-year-old jared laughner. the two-term congresswoman was holding a public event designed to meet her constituents and hear their concerns. >> gabby was doing what 45 she always does listening to hopes and concerns of her neighbors. that is the essence of what our democracy is all about. that is why this is more than a tragedy for those

live in tucson arizona, craig boswell. >>> one senator tonight is calling for a symbol of congressional unity. he says members from both parties should sit together instead of democrats sitting on one side and republicans on the other. >>> the shooting in tucson should -- congresswoman giffords is scheduled on a mission april 19th. reception is set to begin in just the next hour at stanford university for a young man who survived the 2007 shooting at virginia tech university. >>> an alert has gone out to students after someone threatened an active violence on campus. a student found some graffiti on a campus bathroom wall says a violent act would take place at the school next tuesday. officials say they waited until this week to alert the campus in order not to create a panic. the graffiti has been removed. but the writer threaten to kill people, several people a few days from now. >> a little worried about the date that was on the wall, january 18th. >> i think it's unfortunate really. it's clear the person who wrote the message is asking for help. >> reporter: campus officials are ask