Before the rise of the Bush family, the Tafts of Ohio were the most successful political dynasty in the Republican Party. Along with the Democratic Kennedys and flexible Rockefellers, Roosevelts and Adamses, they remain one of the top political families in U.S. history. They are also the oldest still-active family, and longest-running direct descendancy, stretching from Secretary of War Alphonso Taft (1876) to current Ohio Gov. Bob Taft II. The middlemost member of this line,…