A democratic earth would stand a decent chance of marginalizing your social-political-religious group. There's a while lot of demographics on Earth.

Think about a random sampling of all humans. Most are in Asia, esp India and China, and most are traditionally religious.

Would women's rights be a priority? Fair employment? Gay rights?

I do think that an integrated and conscientious Earth is important, especially with reasonable immigration and emigration rights, but I'm not sure I want to vote in a Earth President election.