FILE - In this Oct. 2, 2008 file photo, Democratic vice presidential candidate Sen. Joe Biden, D-Del., left, and Republican vice presidential candidate Alaska Gov. Sarah Palin face off during the vice presidential debate at Washington University in St. Louis. The Commission on Presidential Debates announced the sites announced Wednesday, Sept. 23, 2015, that Washington University will host the second presidential debate on Oct. 9, 2016. (AP Photo/Jeff Roberson, File)