As I said here:
https://uselectionatlas.org/FORUM/index.php?topic=188900.msg4086941#msg4086941
in 1988, E.J. Dionne wrote about the Democrat's demographic crisis, since the GOP had an advantage among the young at that time. By ~1990/1991, when the GOP had won three consecutive presidential elections and Bush was riding high on Gulf War glory, people were talking about the GOP's insurmountable lock on the presidency.
Then after Clinton won two presidential elections, it was all doom and gloom for the GOP, and then the CW switched again after Bush's 2004 win, when Dems half joked about secession of Democratic states from the USA, and many here on Atlas insisted that the Dems would need to nominate an Evan Bayh or a Mark Warner if they wanted any hope of winning a presidential election soon.
Basically, every time a party wins two or more presidential elections in a row, there's a lot of talk about that party's enormous structural advantage, and how the opposition party is doomed.
Sure. Before the 2008 presidential election, I read a columm saying that we were living an era of Republican structural advantage in presidential elections since 1968, because between 1968 and 2004, the republicans won 7 of the 10 presidential elections and 2 of them had more than 10 points margin, and that Clinton won only because Perot splited the conservative vote (maybe not true).
Now I read sometimes that we live an era of Democratic structural advantage since 1992, and this theory considers not the Clinton percentage, but the difference between Clinton and his Republican opponents.
We can build many theories of structural advantages. It is necessary only to select the fruits.
Someone can say that we live an era of Republican structural advantage since the civil war. This period was interrupted only between 1932 and 1952. Except Roosevelt/Truman, 1964 and 2008, the Democrats won only close elections (Cleveland, Wilson 1916, Kennedy, Carter) or when there were strong third party candidates (Wilson 1912, Clinton). On the other side, there were many Republican landslides.
