According to this article:
Chelsea Clinton, an important campaigner and political operative for her mother's campaign, is still "off limits" as if she were a child still. At 28, Miss Clinton should be capable of speaking to the press, but apparently she won't even answer questions for a Weekly Reader kid correspondent. She's not a child anymore; the Reagans used Ron Reagan in the 80's for political purposes, and he wasn't off limits--Chelsea should answer the media's questions. That she won't speak smacks of her status as a liability.
I want to know how capable she is, because if her mom is elected president, you KNOW she will be on the White House payroll. You can't declare your family off limits when they're making campaign calls to superdelegates for you. Buck up Chelsea; it's time to grow up.