Answer:
Populist party
Explanation:
The 16th amendment (graduated income tax) and 17th amendment (direct election of senators) were originally ideas of POPULIST PARTY (an 1890s successful 3rd party who never won a presidential election)
This is evident in the fact that though the Populist Party never won a Presidential election, they were more successful in influencing the political landscape of the United States during their existence.
Some other legacies of the Populist Party are:
1. expansion of currency and credit structure
2. Railroad legislation
3. Postal saving banks
4. Subtreasury plan.
