ARIZONAChelsea Clinton stumps for Hillary Clinton in TempeChelsea Clinton speaks to a crowd while campaigning for her mother, Democratic presidential nominee Hillary Clinton, at Arizona State University in Tempe on Oct. 19, 2016.Michael Chow/The RepublicChelsea Clinton speaks to a crowd while campaigning for her mom, Democratic presidential nominee Hillary Clinton, at Arizona State University in Tempe on Oct. 19, 2016.Michael Chow/The RepublicChelsea Clinton speaks to a crowd while campaigning for her mom, Democratic presidential nominee Hillary Clinton, at Arizona State University in Tempe on Oct. 19, 2016.Michael Chow/The RepublicStudents hold signs before Chelsea Clinton stumps for her mom, Democratic presidential nominee Hillary Clinton, at Arizona State University in Tempe on Oct. 19, 2016.Michael Chow/The RepublicRep. Ann Kirkpatrick, D-Ariz., greets the crowd before Chelsea Clinton speaks at Arizona State University in Tempe on Oct. 19, 2016.Michael Chow/The RepublicChelsea Clinton campaigns for her mom, Democratic presidential nominee Hillary Clinton, at Arizona State University in Tempe on Oct. 19, 2016.Michael Chow/The RepublicSupporters listen to Chelsea Clinton as she stumps for her mom, Democratic presidential nominee Hillary Clinton, at Arizona State University in Tempe on Oct. 19, 2016.Michael Chow/The RepublicChelsea Clinton rallies the crowd while campaigning for her mom, Democratic presidential nominee Hillary Clinton, at Arizona State University in Tempe on Oct. 19, 2016.Michael Chow/The RepublicMollie Rubin, 19, shows her support before an Arizona Democratic Party Early Vote Rally with Chelsea Clinton at Arizona State University in Tempe on Oct. 19, 2016.Michael Chow/The RepublicChelsea Clinton speaks at a rally for supporters of her mother, Democratic presidential nominee Hillary Clinton,at Arizona State University in Tempe on Oct. 19, 2016.Michael Chow/The RepublicChelsea Clinton speaks to a crowd while campaigning for her mom, Democratic presidential nominee Hillary Clinton, at Arizona State University in Tempe on Oct. 19, 2016.Michael Chow/The RepublicChelsea Clinton speaks to a crowd while campaigning for her mom, Democratic presidential nominee Hillary Clinton, at Arizona State University in Tempe on Oct. 19, 2016.Michael Chow/The RepublicChelsea Clinton speaks to a crowd while campaigning for her mom, Democratic presidential nominee Hillary Clinton, at Arizona State University in Tempe on Oct. 19, 2016.Michael Chow/The RepublicMollie Rubin, 19, shows her support before an Arizona Democratic Party Early Vote Rally with Chelsea Clinton at Arizona State University in Tempe on Oct. 19, 2016.Michael Chow/The Republic