Era of the New Majority

[Mister Mets]

This has generally been an excellent well-realized timeline.

I might quibble with specific results, but sometimes parties in real life will have lucky breaks, and run the table (See the 2012 Senate races/ 2014 House races.) This is pretty effective at a What If? is supposed to do, looking at the consequences of certain outcomes. It just happens to be a possible tremendous period for Democrats.