No they weren’t. Candidate Lincoln said numerous times he had no intention to threaten slavery and never said anything to the contrary. In fact he supported stronger fugitive slave legislation. Even if he intended to threaten slavery, he did not have the votes in Congress to do anything to threaten it.
Slavery simply was not threatened.
Lincoln made it clear he had no intention to interfere with slavery where it currently existed. Outside of that he would oppose it as forcefully as he could.
In fact he supported stronger fugitive slave legislation.
Read his First Inaugural and he doesn't seem to be saying that. In fact if you look at this part - "Shall fugitives from labor be surrendered by national or by State authority? The Constitution does not expressly say. May Congress prohibit slavery in the Territories? The Constitution does not expressly say. Must Congress protect slavery in the Territories? The Constitution does not expressly say." - it appears that Lincoln is promoting a looser interpretation of the Fugitive Slave Laws, not a stronger one.
Even if he intended to threaten slavery, he did not have the votes in Congress to do anything to threaten it.
Which he knew. But expansion of slavery? Lincoln strongly believed he could do something about that.