The AP reports that Gov Palin explained the role of VP to fake American third grader Brandon 'Garcia',
"That's a great question, Brandon, and a vice president has a really great job, because not only are they there to support the president's agenda, they're like the team member, the team mate to that president," Palin said.(HT to Matt S who pointed me to this story)
"But also, they're in charge of the United States Senate, so if they want to they can really get in there with the senators and make a lot of good policy changes that will make life better for Brandon and his family and his classroom. And it's a great job and I look forward to having that job," she said.