It wasn't Taft
http://en.wikipedia.org/wiki/William_Howard_TaftIn his first and only term, President Taft's domestic agenda emphasized trust-busting, civil service reform, strengthening the Interstate Commerce Commission, improving the performance of the postal service, and passage of the Sixteenth Amendment. Abroad, Taft sought to further the economic development of undeveloped nations in Latin America and Asia through the method he termed "Dollar Diplomacy." However, Taft often alienated his own key constituencies, and was overwhelmingly defeated in his bid for a second term in the presidential election of 1912.
Might be Johnson.
http://en.wikipedia.org/wiki/Andrew_JohnsonJohnson was nominated for the Vice President slot in 1864 on the National Union Party ticket. He and Lincoln were elected in November 1864. Johnson succeeded to the Presidency upon Lincoln's assassination on April 15, 1865.
As president he took charge of Presidential Reconstruction – the first phase of Reconstruction – which lasted until the Radical Republicans gained control of Congress in the 1866 elections. His conciliatory policies towards the South, his hurry to reincorporate the former Confederates back into the union, and his vetoes of civil rights bills embroiled him in a bitter dispute with some Republicans.[4] The Radicals in the House of Representatives impeached him in 1868 while charging him with violating the Tenure of Office Act, a law enacted by Congress in March 1867 over Johnson's veto, but he was acquitted by a single vote in the Senate.
He is the most recent President to represent a party other than the Republican or Democratic parties, having represented both the Democrats and the National Union Party. He is consistently ranked by historians as being among the worst U.S. presidents.
Heres another candidate
His inoffensive personality caused him to make many friends, but he suffered tragedy in his personal life and as president subsequently made decisions which were widely criticized and divisive in their effects, thus giving him the reputation as one of the worst presidents in U.S. history
http://en.wikipedia.org/wiki/Franklin_Pierce