craig bosswell has more on what to expect when she testifies on thursday. >> reporter: democratic voters think hillary clinton won last week's debate. it's not led to a big boost in her overall be ins. clinton is at 45% in the latest poll. three points higher than before the debate. bern sanders gained five points to 29% while vice president joe biden dropped four points to 18%. 47% said the vice president should go ahead and jump in the race b you that is down from 53% in october. this -- in august, this weekend, he quoted that he still had feet in him. >> she used to say joey, as long as you're alive, you have an obligation to strife and you're not dead until you have seen the face of god. >> reporter: if he has an opening, it's in part due to the opening in benghazi-libya during clinton's term during secretary of state. she'll be on capitol hill thursday to testify again. >> i don't know that i have very much to add. this is after all the 8 other investigation. >> reporter: some republicans hinted the benghazi committee is focused more on derailing her presidential hopes than looking