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SAN FRANCISCO —

Mayor Kevin Johnson introduced presidential candidate Hillary Clinton at the U.S. Conference of Mayors meeting Saturday in San Francisco.

After a warm and energetic welcome, the speech took a serious tone.

“For me and many others, one immediate response was to ask how it could be possible that we as a nation still allow guns to fall into the hands of people whose hearts are filled with hate,” Clinton said.

In the wake of this week’s mass shooting in Charleston, South Carolina, Clinton echoed the same message President Obama expressed on the same podium one day earlier: the need for tighter gun laws.

“We can have common sense gun reforms that keep weapons out of the hands of criminals and the violently unstable while respecting responsible gun owners,” said Clinton.

Those words were met with a standing ovation from the bipartisan crowd.  Clinton also acknowledged the persistence of racism in our country.

“Race remains a deep fault line in America. Millions of people of color still experience racism in their everyday lives,” said Clinton.

The presidential hopeful went on to recognize some good things being done in America’s cities; things like community policing, innovation and work training.

There was even a shout out to Sacramento.

“Kevin Johnson, who has led both Sacramento and this conference so ably, calls this renaissance of urban innovation cities 3.0,” Clinton said.

Mayor Johnson spoke to FOX40 about his “3.0 city” concept.

“A 3.0 city has to be a hub of innovation and entrepreneurship and technology,” said Mayor Johnson.

The mayor says he’s proud of Sacramento, but there’s still work to do.

“When I get back to Sacramento the next topic we’ll be tackling is minimum wage,” said Mayor Johnson.

Baltimore mayor Stephanie Rawlings-Blake will take over as president of the U.S. Conference of Mayors.  She will become the first African-American female president of the organization.

The meeting runs through Monday.