How did South Carolina's response to the 1832 tariff foreshadow secessionist sentiments?

In the 1830s, South Carolina responded to the tariff in
two ways.  First, they asserted that they (and other states) had the right to nullify
laws made by the national government.  Second, they threatened to secede from the
Union.  Both of these foreshadowed what they would do in
1860.

By saying that states had the right to nullify
federal laws, South Carolina was essentially saying that the states were sovereign. 
They were saying that states could pick and choose which federal laws they would obey.  
This really is the next thing to saying that the states can withdraw from the Union
whenever they wish.  In additon, South Carolina threatened to withdraw from the Union if
the federal government tried to collect the tariff by force.  This is much more
explicitly a movement towards secession.

Overall, South
Carolina's actions in the tariff/nullification controversy foreshadowed what it would do
in 1860 because it was asserting the idea that it was a sovereign state that could
choose to obey or disobey the national government as it wished.