Answer:
Lincoln
Step-by-step explanation:
Lincoln could be described as a regional president becuase in the 1860, he only obtained support in the northern free states, plus two western states: California and Oregon. He did not win a single southern slave state.
Buchanan, on the other hand, enjoyed support of California, the totality of the Southern states, and several Northern free states such as Illinois and Pennsylvania in the 1856 presidential elections.
Thus, we can see that Buchanan had a little bit more cross appeal than Lincoln, probably Buchanan was a democrat who supported Slavery, while Lincoln, a Republican, was strongly against it.