"Shameful history" refers to a past that is full of actions, events, or behaviors that are regarded as embarrassing, disgraceful, or morally wrong. Full definition
wrote Engel, who noted Paladino's «similarly shameful history of spreading racially offensive materials and enflaming racial divisions.» (nystateofpolitics.com)
Candidate Muhammadu Buhari, hardly a revolutionary in spite of his ascetic contempt for graft, struck the right message; the people keyed into it; and Jonathan, with his hubris - stricken Peoples Democratic Party (PDP), became shameful history! (nigeriapoliticsonline.com)
«Kevin Cahill owes the people of Kingston, as well as all the people of Ulster County, an enormous apology for his disgraceful behavior, but unfortunately his ego and shameful history virtually ensures that he will not deliver.» (hudsonvalleyone.com)