Yes.
Lincoln.
He had to ride to DC in a closed train.
Most of the tiny federal government which hated him had resigned and gone South. Damage was done the nation when federal arms and supplies were diverted to the insurrectionists. Of course, the government was so small one man could supervise it easily not gigantic as it is now.
Beat me to it. Some speculation Lincoln was in disguise as well. Opposition to Jefferson and JQ Adams pretty substantial as well.