6:09 p.m. ET: If you were picking out a pet dog, would you prefer a gentle breed with a mind of its own? Or would you want one that was loyal and obedient? Based on how you answer, social psychologist and NYU professor Jonathan Haidt thinks he has a pretty good idea how you would vote.

Read "Nightline" anchor Bill Weir's report HERE

3:36 p.m. ET: UPDATE: The heartbreaking investigation into the disappearance of 10-year-old Jessica Ridgeway took a grisly turn today when police said that a body found during their search for Jessica is "not intact."

Read Clayton Sandell's story HERE

1:02 p.m. ET: PICTURE TIME: Look who we found on the Daily Beast homepage!

That's ABC's Martha Raddatz in the foreground, with Nightline producer Ely Brown in the background!

12:17 a.m. ET: ABC News' senior foreign correspondent Martha Raddatz has interviewed generals and international leaders, and tonight she will moderate the vice presidential debate.

Get to know Martha by reading about her HERE

Credit: ABC News

10:33 a.m. p.m. ET: Tonight, it's the battle for number 2.

Vice President Joe Biden and Wisconsin Rep. Paul Ryan will face off in their only head-to-head meeting of the presidential race tonight as the Democrats look for a boost after President Obama's lackluster effort in Denver last week and Republicans seek to maintain some momentum after Mitt Romney's command performance.

Want to impress your friends at tonight's debate watch? Read ABC's Michael Falcone and Amy Walter's analysis of what's to come HERE.

Credit: Justin Sullivan/Getty Images | Carolyn Kaster/AP Photo