The Constitutional Convention of 1787 enacted compromises to placate the Southern states on the slavery question. The two most important issues related to slavery were the Slave Trade and the 3/5's Compromise. Rather than restricting the slave trade, the convention agreed to make no law suppressing or regulating the Atlantic Slave Trade, which allowed it to continue for twenty additional year until 1807. The second compromise pertained to representation in the House of Representatives. The 3/5's Compromise allowed the enslaved to be counted as 3/5's to balance representation in the House of Representatives between slaveholding and non-slaveholding states.
Based on the statement, it could mean that the writer of the
one who made the statement does not think that political parties have the
chances of winning and in the same time, they are likely to cause more harm
than to cause something good.