Gifford, whose injuries after a 2011 shooting make it difficult for her to speak, chanted portion at Tucson synagogue

First section of Wednesday's convention dedicated to gun control; other topics include undocumented migrants and climate change -- and especially the rise of women in politics

'A growing pattern of violent anti-Semitism has now turned into a crisis for our nation,' says mayor of nearby New York City, announcing extra cops to guard Jewish sites