Elections when both major candidates were Conservative/Liberal

[Unconditional Surrender Truman]

1924 is the obvious example of a presidential election in which both major parties nominated conservatives. I suppose you could argue that Carter and Ford were somewhat similar as well. There are far more elections in which both major party candidates were liberals: off the top of my head, 1904, 1912, 1940, and 1948 are all contenders.