"It's important that the president of the United States shows up at these meetings," she said.
"The Chinese president, Xi Jinping, showed up. Russian President Vladimir Putin showed up, and they were able to dominate the proceedings," Clinton said, "and they were able to cock an eyebrow and ask a question like, well, maybe we can't count on the Americans any more. Maybe it's time to, in the words of one Chinese official, de-Americanize the world. Maybe we should even start thinking about a different reserve currency than the American dollar."
Wednesday's trip was Clinton's second to upstate New York in recent weeks. She spoke earlier this month at Hamilton College, lamenting as she did again in Buffalo that too many people in politics were choosing "scorched earth over common ground."
Clinton represented New York in the Senate from 2001-2009 before being named secretary of state by Obama, who she campaigned against for the Democratic presidential nomination in 2008.
Polls show she would be the leading contender for the White House in 2016 if she decides to seek the presidency again.