Definition: In this task, you will be presented with a passage and have to answer a question based on your understanding of the events inferred from the passage. Try to find the best answer that is most likely to fill in "_". Note that the URLs in the text have been replaced with [Link].
Input: Editor's note: Join Roland S. Martin for his weekly sound-off segment on CNN.com Live at 11:10 a.m. ET Wednesday. If you're passionate about politics, he wants to hear from you. A nationally syndicated columnist, Martin has said he will vote for Barack Obama in November. He is the author of "Listening to the Spirit Within: 50 Perspectives on Faith" and "Speak, Brother! A Black Man's View of America." Visit his Web site for more information. Roland S. Martin says the McCain campaign has done Sarah Palin a disservice by keeping her hidden. (CNN) -- Is Alaska Gov. Sarah Palin running for vice president of the United States or vice president of the student council?Vice presidential candidate can make world of difference, Roland Martin saysMcCain campaign has done Palin a disservice, he writesMartin says American people want to know where she standsThursday's debate will be proving ground, Martin writes 
 Question:The truth is, the nation doesn't know much about _.

Sarah Palin