American Idol winner David Cook also gives a surprise performance at the show .
美国偶像冠军大卫·库克作为神秘嘉宾惊喜亮相。
Analyst David Wasserman of the Cook Political Report says Republicans already appear within striking distance of a victory in the House .
库克政治报导的分析家大卫·威瑟曼说，共和党人看来已经在众议院胜利在望。
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