Geez Larry Davis....recent American history isn't that hard to understand (unless of course you purposely don't want to understand it). So I'll help ya out here:

In the 1960s there was a fight for the heart and soul of the Democratic party...should it follow the tradition of the southern pro-Jim Crow democratic racists or follow the Northerner Democrats who were fighting for desegregation and voting rights for black Americans. Well Larry, in case you haven't heard, the Northerners won and the southern racists in the democratic party became republicans because the republican party was supportive of the segregation now, segregation tomorrow, segregation forever platform and trying its best to keep black Americans from voting. Hence, since the late 1960s/early 70s, the ideals of Lincoln have belonged to the Democratic party. 

There....you just learned something today Larry. BTW, you're welcome.