Dejected McCain supporters wary of Obama

(CNN) -- As Sen. John McCain bowed out of the historic presidential election Tuesday night, he urged his supporters to bridge their differences with Sen. Barack Obama and unite for the good of the country.

Supporters of John McCain react as their candidate concedes in Phoenix, Arizona.

"Sen. Obama and I have had and argued our differences, and he has prevailed. No doubt many of those differences remain. These are difficult times for our country. And I pledge to him tonight to do all in my power to help him lead us through the many challenges we face," he said.
Just the mention of the Democrat's name elicited boos from the sea of teary-eyed McCain supporters at the Arizona Biltmore in Phoenix, Arizona.
Members of the dejected crowd shouted "no way!" when McCain promised to work with Obama. Watch McCain's concession speech »
As McCain graciously acknowledged defeat, it was clear that not all of his supporters were ready to rally behind the president-elect.
Kevin Neugebauer of Katy, Texas, said he was "really disappointed " and "distraught" about his party's loss.
"Being a conservative, I think the Republican Party's kind of lost some of their identity of who they are. I really don't understand how it could happen," he said. "I don't know if it's really sunk in. It's hard to understand." Watch more on McCain's loss »