Vice President Kamala Harris is emphasizing her record as California attorney general to make her case for voters on border security.ROBYN BECK/AFP via Getty ImagesVice President Harris is defining her positions on border security independent of President Biden.The Harris campaign is already running ads presenting the VP as a tough-on-crime prosecutor.Such an approach could keep Arizona blue and narrow Trump's path to return to the White House.Last Friday, Vice President Kamala Harris and her running mate, Minnesota Gov.