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US Conference of Mayors Vice President, Stephanie Rawlings-Blake, of Baltimore, Maryland is seated before an address by US President Barack Obama to the US Conference of Mayors during their annual meeting at a hotel in San Francisco, California on June 19, 2015. AFP PHOTO/ MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP via Getty Images)

US Conference of Mayors Vice President, Stephanie Rawlings-Blake, of Baltimore, Maryland is seated before an address by US President Barack Obama to the US Conference of Mayors during their annual meeting at a hotel in San Francisco, California on June 19, 2015. AFP PHOTO/ MANDEL NGAN        (Photo credit should read MANDEL NGAN/AFP via Getty Images)