Third parties have been successful in all of the following roles EXCEPT:
A supporting a specific issue
B. forming as protest groups
C. impacting election results
D. becoming a dominant party

D. becoming a dominant party

Explanation:

Third parties have been unsuccessful in becoming a dominant party because they often represent an ideology that is considered too radical by the mainstream parties and their constituents. They fail simply because the American political system is designed to support only two major parties. As well as this, 48 of the 50 states employ a winner-takes-all system for electoral votes.

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