[pf] Too bad he did not. If he had forced the northern states to obey the Supreme Law, there would have been no reason for the southern states to secede. 836
OK, who are you referring to with this statement, if not Lincoln?
According to the South Carolina declaration, "For twenty-five years this agitation has been steadily increasing, until it has now secured to its aid the power of the common Government". The answer to your question is, all presidents that served during those 25 years. Lincoln's announcement that he had no intention of enforcing the law when he took office, but rather to subvert it in favor of his political party's ideology, was, to be brief, the final straw.
You can read the entire South Carolina declaration at the Avalon Project at Yale Law School.