From Ohio History Central
The Ohio Progressive Republican League was the predecessor to the Progressive Party in Ohio. In the late nineteenth and early twentieth century, many Americans were concerned about the dramatic changes that were occurring in American politics, society, and the economy as a result of forces such as industrialization, immigration, and urbanization. Both in Ohio and elsewhere, these Americans organized reforms that became part of the Progressive Movement. Progressives were not originally part of a separate political party, but the Presidential Election of 1912 caused a split in the Republican Party that eventually led to the creation of the Progressive Party.
The Republican Party in Ohio split in January 1912, and many Progressives left the party to found the Ohio Progressive Republican League. Originally the league supported Wisconsin reformer Robert M. Lafollette's candidacy, but soon its members began to support Theodore Roosevelt's campaign instead. When Roosevelt separated from the Republican Party to form the Progressive Party, also known as the "Bull Moose" Party, the Ohio Progressive Republican Leagues members affiliated themselves with this new party as well. Ultimately the divisions within the Republican Party contributed to Democrat Woodrow Wilson's election. The league, as well as the Progressive Party, was short-lived. Both the Democrats and the Republicans adopted some aspects of the Progressive platform, pulling supporters away from the new party and leading to its demise.