参考答案：对

解析：
Mr. Bush, the son of a president and the grandson of a senator, castigated Mr. Kerry as a Washington insider who has been in Congress so long that he has taken both sides on just about every issue.

[分析]： 特定信息的找寻和判断。
根据题干中的关键词Mr. Kerry，排除原文有关Mr. Bush内容的干扰，重点理解原文后半句内容“Mr. Kerry…has taken both sides on just about every issue．”即“Mr. Kerry在每件事情上都颇受两方的好评。”这与题干中 has never let anybody down即“不让任何人失望”的说法相吻合，因此该题的说法是正确的。
[解题关键] 同义词替换。原文中take both sides与选项中never let anybody down意思相同。