No, a Whig is not a Democrat. The Whig Party was a political party in the United States that existed in the mid-19th century. It was generally more conservative than the Democratic Party of that time.
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The Whig party
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William Henry Harrison was the ninth president of the United
States. He was a member of the Whig party. Harrison only held
office for one month, and was the first president to die while
serving.