Make up a history that in 2015 monarchy, not just parliamentary gov't is considered the most democratic system in the West.
Bonus:
1) Make it a limited monarchy (the monarch having real power between the french president and the american president, and being expected to use it) seen as the most democratic.
2)Make the US a monarchy or monarchies.
3) Make it so state marriages still exist in 2015.
Most likely this is impossible challenge, but it will be fun to read if anyone can come up with a tl.