David Eldridge The Washington Times - September 16, 2010, 10:52AM

While Christine O’Donnell, the surprise tea party candidate who is now the GOP’s nominee for Senate in Delaware, is being treated like a punchline by much of the political and media establishment, one senior Democrat issued a word of warning Wednesday.

After host Rachel Maddow referred to O’Donnell as “unelectable” during an interview for her MSNBC show, Vice President Joseph Biden cautioned Democrats against overconfidence:

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“It’s a big mistake not to take it seriously,” Biden told Maddow.

Here’s the clip:

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