A week ago I noted a new Republican push to gerrymander the electoral college to make it almost impossible for Democrats to win the presidency in 2016 and 2020, even if they match or exceed Barack Obama’s vote margin in 2012. Is something like that really possible? Yes, very possible.To review, here’s how it works. The US electoral college system is based on winner take all delegate allocation in all but two states. If you get just one more vote than the other candidate you get all the electoral votes. One way to change the system is go to proportional allocation. That would still give some advantage to the overall winner. But not much. The key to the Republican plan is to do this but only in Democratic leaning swing states — not in any of the states where Republicans win. That means you take away all the advantage Dems win by winning states like Ohio, Pennsylvania, Michigan and so forth.

But the Republican plan goes a step further.

Rather than going by the overall vote in a state, they’d allocate by congressional district. And this is where it gets real good, or bad, depending on your point of view. Democrats are now increasingly concentrated in urban areas and Republicans did an extremely successful round of gerrymandering in 2010, enough to enable them to hold on to a substantial House majority even thoughthey got fewer votes in House races than Democrats.

In other words, the new plan is to make the electoral college as wired for Republicans as the House currently is. But only in Dem leaning states. In Republican states just keep it winner take all. So Dems get no electoral votes at all.

Another way of looking at this is that the new system makes the votes of whites count for much more than non-whites — which is a helpful thing if you’re overwhelmingly dependent on white votes in a country that is increasingly non-white.

This all sounds pretty crazy. But it gets even crazier when you see the actual numbers. Here’s a very illustrative example. They’re already pushing a bill to do this in the Virginia legislature. Remember, Barack Obama won Virginia and got 13 electoral votes. But as Benjy Sarlin reported today in a series of posts, if the plan now being worked on would have been in place last November, Mitt Romney would have lost the state but still got 9 electoral votes to Obama’s 4. Think of that, two-thirds of the electoral votes for losing the state. If the Virginia plan had been in place across the country, as Republicans are now planning to do, Mitt Romney would have been elected president even though he lost by more than 5 million votes.

Remember, plans to do this are already underway in Michigan, Pennsylvania, Ohio and other states in the Midwest.

This is happening.