This is effectively Maine pursuing a system of proportional representation for voting, which is the system of voting operated by most of the world's forward thinking democracies. Its only backwards nations, like the US and the UK, which still operate unrepresentative FPTP based systems, which are long past the point of being democratic.
The problem with Maine's approach is that is looks to be the PR system known as Alternative Vote, which is quite complicated and probably the worst option for operating PR.
Still, its a start.