AURORA, Colo — President Barack Obama on Sunday sought again to provide comfort to hurting and grieving families, sweeping into Colorado to privately console relatives of the victims gunned down in a movie theater. The massacre left 12 people dead, dozens injured and a nation in stunned sorrow.

Air Force One touched down at Buckley Air Force Base in Aurora late Sunday afternoon for the Obama’s hastily arranged 2½-hour visit.

A short time later, Obama began his visit with the family members at the University of Colorado Hospital in Aurora, which treated 23 of the people injured in the mass shooting; 10 remain there, seven hurt critically. The hospital is a short drive from the site of the shooting.

Obama was expected to make a statement to the press later Sunday night.

For a president nearing the end of his term and seeking a second one, it was another grim occasion for him to serve as national consoler-in-chief, a role that has become a crucial facet of the job. National tragedies can present an opportunity for presidents to show leadership and rise above partisan politics, as with President Bill Clinton and the Oklahoma City bombing and President George W. Bush and the Sept. 11 attacks.

But in moments of sorrow, presidents can risk looking detached and out of touch. Bush’s handling of Hurricane Katrina is an often-cited example.

Obama was accompanied at the hospital by Colorado Gov. John Hickenlooper and Aurora Mayor Steve Hogan.

A single suspect, James Holmes, is being held without bond on suspicion of multiple counts of first-degree murder after the shooting rampage, which occurred minutes into a premiere of “The Dark Knight Rises” early Friday in this suburb outside Denver.

Sunday’s trip was Obama’s second time to Colorado in less than a month to comfort residents in a state that’s critical to the November election. He made a quick visit in late June to Colorado Springs, where hundreds of homes were destroyed in the most devastating wildfire in the state’s history.

“These families need that kind of contact by our elected leader,” Oates told CBS’ “Face the Nation.” “It will be very powerful and it will help them. As awful as what they’ve been through and what they’re going through has been, having the president here is very, very powerful.”

“I think the president coming in is a wonderful gesture,” Hogan said on ABC’s “This Week.” “He’s coming in, really, to have private conversations with the families. I think that’s totally appropriate.”

Obama already had been a frequent election-year visitor to Colorado, which he won by more than 8 percentage points over Republican John McCain four years ago. But neither Obama’s nor GOP challenger Mitt Romney’s camp expects that big a margin this time. Recent polls place Obama’s lead inside the margin of error.

The shock of the mass shooting brought the presidential campaign to a standstill for the weekend. Obama cut short a political trip to Florida to return to Washington and Romney canceled interviews. Both campaigns pulled ads off the air in Colorado out of respect for the victims.

“This weekend I hope everyone takes some time for prayer and reflection,” Obama said Saturday in his weekly radio and Internet address, “for the victims of this terrible tragedy, for the people who knew them and loved them, for those who are still struggling to recover.”

Obama campaign spokeswoman Jen Psaki said Sunday during a briefing on Air Force One that the Obama campaign will keep its television ads off the air in Colorado through the whole week.

Psaki said the campaign canceled a grassroots event scheduled for Portland, Ore., Tuesday in part because resources had to be diverted to Colorado for the president’s trip. She said it was appropriate to cancel the grassroots rally because of the tone of that type of campaign event.

But some election activities were to resume Monday.

From Colorado, Obama was to fly to San Francisco to start a previously scheduled three-day campaign trip that includes a speech to the Veterans of Foreign Wars in Reno, Nev., fundraisers in California, Oregon and Washington state, and a speech to the National Urban League convention in New Orleans.

Romney is scheduled to address the VFW Tuesday.

The task of articulating sorrow and loss has become a familiar one for Obama.

In November 2009, he led mourners at a service for victims of the mass shooting at Texas’ Fort Hood. In January 2011, he spoke at a memorial for the six victims killed in Tucson, Ariz., when a gunman attacked Rep. Gabrielle Giffords as she met with constituents.

The following April, when some 300 people were killed in a multistate series of tornadoes, Obama flew to Tuscaloosa, Ala., to commiserate with residents whose homes were in ruins. A month later, Obama went to Joplin, Mo., after a monster twister claimed 161 lives. This year, he came back on the storm’s anniversary to give a commencement speech at Joplin High School.

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Associated Press writers Mark Smith in Washington contributed to this report.