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updated 1/11/2011 8:50:22 AM ET 2011-01-11T13:50:22

The nation's capital lumbered to work in a pall Monday, somber from the Congress to the White House, as official Washington absorbed an assassination attempt against one of its own.

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Giving voice to the grief, President Barack Obama conceded that everyone was still in shock.

By the end of the long day, Obama had secured plans to travel on Wednesday to the site of the shooting rampage, Tucson, Ariz., to attend a memorial service. Senior administration officials confirmed the trip to The Associated Press on condition of anonymity because it had not yet been formally announced.

Video: Obama to attend Tucson memorial service (on this page)
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It was many hours earlier, on a frigid winter's morning in Washington, that Obama led a national moment of silence for the 19 people shot outside a grocery store in Arizona on Saturday, including Democratic Rep. Gabrielle Giffords.

She was the target of the attack and, remarkably, was fighting for recovery despite being shot in the head from close range. Six other people were killed, including a young girl.

Story: Obama: U.S. grieving, shocked over Ariz. rampage

With the House and Senate in recess, the Capitol was relatively quiet, with only the occasional tour group in the Rotunda or the old Senate chamber. In a nearby office building, people lined up to signs books of condolences and best wishes. Security felt tighter.

"In the coming days, we're going to have a lot of time to reflect," the president said from the Oval Office. "Right now, the main thing we're doing is to offer our thoughts and prayers to those who have been impacted, making sure that we're joining together."

Searching for a unifying moment
Obama and congressional leaders were figuring out their next steps in response to the shooting, searching for the right time, place and tone for a unifying moment. The president said the whole country needs to show its loss but also speak to a sense of hope. The question, he said, is "how, out of this tragedy, we can come together as a stronger nation."

Congress scuttled its schedule. Sadness, anger and disbelief took over.

"I traveled to Iraq with Gabby several years ago. We walked the streets of Baghdad together and did not face the violence she faced over the weekend in her own country," said Democratic Rep. C.A. Dutch Ruppersberger, referring to Giffords by her nickname. Rather than the overtly political plan of voting on the repeal of Obama's signature health care overhaul, the House will vote this week on a resolution of support for Giffords and the other victims of the shootings.

Video: Picking up the pieces in Tucson

Giffords' doctors said they were optimistic for her survival and recovery, though just determining the extent of such brain injuries can require weeks or months. Even if she were incapacitated for an extended period, it would be nearly unprecedented for the House to remove her from office before her term expired.

Only once has the House declared a lawmaker's seat vacant due to physical or mental impairment. In that case, Rep. Gladys N. Spellman, D-Md., had suffered a severe heart attack on Oct. 31, 1980, that left her in a coma. A few days later, voters elected her to a fourth term. In February 1981 the House approved a resolution to vacate the seat after receiving a medical analysis that Spellman was in a "trance-like state" and unable to take the oath of office. She never regained consciousness and died in 1988.

McConnell says Senate will continue its work
In the Senate, Republican leader Mitch McConnell said the Arizona shootings won't deter members from doing their jobs. "A strong democracy depends on a free and robust exchange of ideas," he said. "The actions of one deranged man this past weekend will not hinder that."

Prosecutors have charged 22-year-old Jared Loughner with the shootings.

At the Capitol, the chief law enforcement official in the House, Sergeant-at-Arms Bill Livingood, and representatives from the Capitol police briefed congressional staff on the shooting. He counseled them on steps they should take to ensure the safety of lawmakers and their constituents.

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He said congressional offices should establish a contact with local law enforcement, When lawmakers are home, he said, they should share their schedule with local police. He also pleaded with staff members to fill out an emergency contact form.

Amid the mourning, Sen. Frank Lautenberg, D-N.J., a longtime advocate of gun control, said he would introduce legislation later this month to ban high-capacity ammunition clips. The measure would re-establish a prohibition that lapsed in 2004 on clips that feed more than 10 rounds at a time.

"The only reason to have 33 bullets loaded in a handgun is to kill a lot of people very quickly. These high-capacity clips simply should not be on the market," Lautenberg said in a statement.

Video: Despite tragedy, gun control still a tough sell (on this page)

As Washington's agenda adjusted, Obama postponed an economic trip to New York on Tuesday. The first lady, Michelle Obama, scrapped her own Tuesday event with business leaders until a more appropriate time.

Moment of silence
At 11 a.m. EST Obama and his wife walked out of the White House to the sounding of a bell. They stood in silence, flanked by the collection of advisers, kitchen staff, maintenance workers and clerks who keep the White House running.

The scene was reminiscent of the moment of silence held every year on Sept. 11.

At the same time, farther down Pennsylvania Avenue, hundreds of legislative aides stood on the east steps of the Capitol, heads down in silence. And at the Supreme Court, the justices paused to reflect, too, between the two cases they were hearing Monday morning.

The White House said Obama had called Gifford's husband, Mark Kelly, and the family of Christina Taylor Green, a 9-year-old girl killed in Saturday's attack, among others.

Obama also sought to shift some attention to those who acted with bravery as a horrifying scene unfolded in front of them on Saturday in Tucson. He spoke of a college student who ran into danger to rescue his boss, and a wounded woman who helped keep the suspect from reloading ammunition, and other citizens who wrestled the man to the ground.

"Part of what I think that speaks to," Obama said, "is the best of America."

Copyright 2011 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

Video: Obama to attend Tucson memorial service

  1. Closed captioning of: Obama to attend Tucson memorial service

    >>> as we mentioned president obama will head to arizona to speak to a memorial service on wednesday to support and remember the victims of the shooting. nbc's white house correspondent savannah guthrie has details. savannah, good morning.

    >> reporter: good morning to you meredith. the president just accepted this invitation by the university of arizona at 6:00 eastern time last night and they just started working on this speech. the president has said he feels the need to speak to this sense of loss. he wants to share remember brnss with the victim and try to be here to pull the community together. that's the purpose of him coming. there's no word yet on whether the president will address what a lot of people are talking about which of course is the divisive political climate we have seen.

    >> savannah, i know that that is your alma mater , your house is about five minutes away from where the shooting occurred, yo your -- the shock has to be wearing off at this point?

    >> the shock is there and you just talk to people and they're prone to burst into tears. they can't believe it happened here. this is a big city , it's grown so much even in the time i have moved away. but in many ways, it's still a tight knit community. they call it the old pueblo, a sleepy desert town and people are so shocked and they don't want the rest of the country and the world to see them in this way. in many ways i don't think it can ever really sink in. i asked somebody, do you think tucson has lost its innocence, and they said i don't want to believe that, but in some ways, yes.

    >> savannah guthrie , thank you so much.

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