Democratic VP candidate gives big speech next Wednesday at convention . Barack Obama 's campaign sends e-mail with subject : `` Vice presidential ... '' The email was sent to supporters of Sen. Hillary Rodham Clinton and her running mate, Senator Joe Biden, who are scheduled to speak on Thursday in Philadelphia. Tim Kaine considered top tier contenders . Kaine , on the other hand , seems to have no qualms about taking the main stage this week . Obama has big campaign event Saturday ; VP pick could join him .
Democratic VP candidate gives big speech next Wednesday at convention . Barack Obama 's campaign sends e-mail with subject : `` Vice presidential ... '' The email was sent to supporters of Sen. Hillary Rodham Clinton and her running mate, Senator Joe Biden, who are scheduled to speak on Thursday in Philadelphia. Tim Kaine considered top tier contenders . Obama has big campaign event Saturday ; VP pick could join him .