(CNN) - A moment in last week's GOP presidential debate – in which some members of the audience could be heard openly booing a gay solider – was harshly criticized by prominent Democrats Tuesday.
Vice Pres. Joe Biden, speaking on ABC's "The View," said the audience response was "reprehensible."
"I did have a visceral response," Biden said of the moment he heard the booing. "I'm not sure it's because my son spent a year in Iraq, and I know my son and all kids with him. I don't think they give a damn whether the guy firing the rifle to protect them is gay or straight. I don't think they care about. Now, look, this kid risked his life, this kid was there for a year – and I quite frankly, I thought it was reprehensible."
Meanwhile, at a campaign event in New Hampshire, senior Obama campaign adviser David Axelrod slammed the Republican candidates for not condemning the booing as it happened.
"Not one person on that platform, not one candidate, was willing to say 'Don't do that,' was willing to say 'It's inappropriate to boo someone who is risking his life for our country'," Axelrod said.
After the debate, former Pennsylvania Sen. Rick Santorum said he hadn't heard the booing when the question was asked. Santorum was being asked the question when the incident occurred.
"I condemn the people who booed that gay soldier," Santorum said on Fox News the day after the debate. "Certainly had I heard them, I would have said, 'Don't do that. This man is serving our country and we are to thank him for his service'."
-CNN's Abby Livingston contributed to this report.