Vallandigham returned to the United States " under heavy disguise " and publicly appeared at an Ohio convention on June 15 , 1864 . President Lincoln was informed of his return . On June 24 , 1864 , Lincoln drafted a letter to Governor Brough and General Heintzelman stating " watch Vallandigham and others closely " and arrest them if needed . However , he did not send the letter , and it appears he decided to do nothing about Vallandigham 's return . In late August , Vallandigham openly attended the 1864 Democratic National Convention in Chicago . He was a District Delegate for Ohio
1864 Democratic National Convention
1864 Democratic National Convention
Clement Vallandigham