Boston mayor says city is safe, cheering for Boston-area native to win marathon

Boston's new mayor, Marty Walsh, called this year's Boston Marathon "a living, breathing celebration of our resilience." A few hours before the start of the marathon, he spoke with "CBS This Morning" co-host Norah O'Donnell and thanked those who have shown their support for the city.

"This whole weekend has been an emotional milestone in Boston," Walsh said. "It's incredible -- the people who have come here from all over the world to run in this marathon, but really the survivors have shown incredible strength and the families of lost loved ones, they are just so strong. We're feeding off their energy."

"There's plenty of security out in the street, but also a lot of fun's going to happen, so it's not going to look like there's a lot out there, but there's a lot of people out there."

In addition to extra police, undercover officers and bomb-sniffing dogs, more than 100 security cameras have been installed.

Walsh also said he expects many of the bombing survivors to be at the finish line.

"I spoke to one survivor, [whose name] I won't mention - he hasn't been back to the finish line yet," Walsh said. "It's very difficult for him, and I can't imagine what he's going through. He claims to me that he'll be there today. ... I said, 'Listen, call me. I'd love to stand with you, to be there.' He wants to be there because people are running on his behalf, people who have helped him over the last year."

"They've taken a very bad situation, and it's very difficult for them, and they're raising money to give back to the kids and give back to the community," he said.

Walsh said he hopes Boston-area native Shalane Flannigan wins the race.

"In my heart, that's what I'm all about, but I don't want to jinx anybody. So I'm going to be standing there watching when those elite runners take the left on Hereford Street--I'm hoping to see her in the lead."