Grant was a nice guy, it was his friends and appointees that screwed his administration up. He put his trust in the wrong people.
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Not always, but it was his one big flaw. It hurt him as president and later on in business.
Yes, in many respects, Grant was too nice a guy. His work in the South following the War was magnificent, but loyalty to friends in Washington led him to overlook too many of their shortcomings.
I have his picture hanging in my man cave, along with a door knob from one of his homes on a army post.