9. Lyndon Johnson
Some people have fond memories of this president, mainly due to his involvement in Medicaid and fighting for civil rights, both noble pursuits. However, Johnson has always had a murky history regarding ethics, with even his biographer alleging that he actually fixed the election which earned him a place in the US Senate. The biographer described how he overcame a 20,000 vote deficit and garnered a victory with an incredible 47 votes.
While in Senate, he used his powers for personal gains rather than serving the country and managed to get approval which allowed his wife to purchase television and radio stations. He then used his power to expand their reach so that the revenues and profits could increase accordingly. These decisions netted Johnson millions and ultimately made him a rich man.