As for the Fugitive Slave Act... because it was the law? Though there was a strong faction committed to overturning the law the fear of a national split over the issue prevented any further moves.
And votes in Congress, lol, the South wasn't and isn't a nation. This is like claiming that Wyoming is being bullied because it doesn't have as many representatives as California. Welcome to a Representative Democracy.
Lincoln was committed to the abolition of slavery before he even took office. Lincoln was certainly a moderate within the Republican Party but he nevertheless had a clear position and plan which he outlined at the Republican National Convention where he called for the immediate halt to the expansion of slavery and the creation of a system of monetary compensation to slave owners in order to begin the gradual process of abolition. On the fundamental difference between North and South Lincoln stated on numerous occasions that "You think slavery is right and ought to be extended; we think it is wrong and ought to be restricted".
As President, Lincoln consistently differentiated between what he termed "my view of official duty" which took the form of doing nearly anything he could to prevent his country from falling apart. However he never wavered in his belief that slavery was wrong and that it ought to be abolished.
To the point "I am naturally anti-slavery. If slavery is not wrong, nothing is wrong. I can not remember when I did not so think, and feel this way."