You technically can- the only thing we disallow is people asking and answering their own questions (e.g. through separate accounts).
Though keep in mind that the spirit of the contest focuses on answering real Questions people ask. If, say, you want to ask a family member to write a Hub on something you really want advice on, that's perfect! If, however, you have an idea for a Hub you want to write as an entry in the contest and ask someone you know to ask that Question... it's technically OK, but it's not the point of the contest, hehehe ^_^;;