Why was the campaign in 1828 considered dirty

The campaign was marked by large amounts of nasty "mudslinging." Jackson's marriage, for example, came in for vicious attack. When Jackson married his wifeRachel in 1791, the couple believed that she was divorced, however the divorce was not yet finalized, so he had to remarry her once the legal papers were complete. In the Adams campaign's hands, this became a scandal. Charles Hammond, in his Cincinnati Gazette, asked: "Ought a convicted adulteress and her paramour husband be placed in the highest offices of this free and Christian land?" Jackson also came under heavy attack as a slave trader who bought and sold slaves and moved them about in defiance of modern standards of morality (he was not attacked for merely owning slaves used in plantation work). TheCoffin Handbills attacked Jackson for his courts-martial, execution of deserters and massacres of Indian villages, and also his habit of dueling!!!

Hope this helped!!

When Jackson married his wifeRachel in 1791, the couple believed that she was divorced, however the divorce was not yet finalized, so he had to remarry her once the legal papers were complete

Idont understand the question