I have made a few maps contrasting elections different in time. When the map shows mostly red and blue, then the partisan voting within the states looks similar (as between 1928 and the two Eisenhower elections). When one sees huge tracts of colors other than blue and red (as between the Eisenhower and Obama elections) one notices that partisan identities of the states have largely flipped.
If anyone has any doubt that the Presidential Election of 1976 is ancient history for all practical purposes:
Carter 1976, Obama 2008/2012
Carter 1976, Obama twice red
Carter 1976, Obama once pink
Carter 1976, Obama never yellow
Ford 1976, Obama twice white
Ford 1976, Obama once light blue
Ford 1976, Obama never blue
....As you can see, Carter lost a raft of states (among them California, Oregon, Washington, Illinois, Michigan, New Jersey, Connecticut, Vermont, and Maine) that Democratic nominees for President have not lost after 1988, and some states (Iowa, Nevada, New Hampshire, and New Mexico) that Democrats have not LOST in Presidential wins. On the other side, Carter was the last Democrat to win Alabama, Mississippi, South Carolina, or Texas.
I see the 1976 Presidential election as the last hurrah of the core of the New Deal, with the Democratic nominee depending heavily upon the South for votes and losing heavily in the Far West and Midwest.
How different is 1976 from 2012? In 1976, Carter won every former Confederate state except Virginia. In 2012, Obama came close to losing every former Confederate state except Virginia.
As polarized as America is in state partisanship, I can rank the most likely parallels for the electoral map:
1. 2012
2. 2000
3. 2004
4. 2008
I don't see how the Democrats win the sorts of states that Bill Clinton win in 1992 and 1996 this time, so 1992 and 1996 are not likely parallels. Neither the Democrats nor the Republicans have an appreciable chance of winning anything like the 428 electoral votes that the elder Bush won in 1988.