All of the following might have joined the Free-Soil party EXCEPT:

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The Free-Soil party opposed the expansion of slavery into the western territories, which was not a stance typically supported by "cotton Whigs," who were more favorable toward the institution of slavery. The other groups listed (supporters of the Wilmot Proviso, admirers of Martin Van Buren, Liberty party members, and "conscience Whigs") were all more likely to have joined the Free-Soil party given their opposition to the expansion of slavery.

All of the Following Might Have Joined the Free-Soil Party