A testy moment between President Barack Obama and Ariz. Gov. Jan Brewer Jan. 25 has been pointed to by one leading commentator as another sign of disrespect for the commander-in-chief.

In a photo, the Republican governor can be seen putting her finger in Obama’s face as the two discuss her new book.

CBS News chief Washington Correspondent Bob Schieffer said the exchange shows the lack of respect for the office of president.

“This is just another sign of the incivility and really the vulgarity of modern American campaigns. These campaigns have gotten so ugly and so nasty, that they’re now tarnishing the whole system,” he said in an interview on CBS Evening News. “I think it also underlines the coarseness of our culture in this age of social media when it is so easy to say anything about anybody and get no penalty for saying it.”

“The thing that has always made our system so strong is that whatever we have thought of the office holders, we have held the offices themselves in high respect. We have respected the office,” he continued. “I’ve watched a lot of presidents over the years but I can never recall a president stepping off Air Force One, which is itself a symbol of the presidency and American democracy, and being subject to such rudeness.”

Brewer said she wanted to talk about issues her state was facing, but the president quickly changed the topic to her recent book, “Scorpions for Breakfast.”

“I started off talking about jobs and the economy and the Arizona comeback and what a great job we have done here. We are leading the nation,” Brewer told reporters. “He changed the subject to my book.”

According to reports, their flap was over a passage in the book in which Brewer describes a meeting between the two in June 2010. The topic of discussion was Arizona’s controversial immigration laws, with both sides initially describing the meeting as cordial. But in her book, Brewer reportedly said that Obama was “condescending” to her.

“It wasn’t long before I realized I was hearing the president’s stump speech,” Brewer wrote. “Only I was supposed to listen without talking. He was patronizing.”

White House officials said that account of the meeting is inaccurate and flies in the face of Brewer’s own description of the meeting in its immediate aftermath. Obama agreed, telling ABC News that the altercation with Brewer is getting overblown.

“I think it’s always good publicity for a Republican if they’re in an argument with me,” Obama said. “But this was really not a big deal. She wanted to give me a letter, asking for a meeting. And I said, ‘We’d be happy to meet.’”

Whether or not the incident was good publicity for Brewer, it gave a big boost to her book sales. According to The Wall Street Journal, the book ranked 276,665th on Amazon.com’s best seller list. By midday Friday, it had risen to number 9 overall.