How about we do a hostile takeover of the Republican party. In 2008 and 2012 their presidential nominee won fewer than 10 million votes in the primaries. If we got all the nation's progressives together and ran candidates in every district we could take over the Republicans and flip them to a left progressive party. Of course they'd try to block it, and they might even make a third party, but if we use some stealth the first few years, we could seriously change the whole direction of politics in the USA. I mean, isn't it kind of what they did with the DLC?
And I don't mean Log Cabin COP Proud takeover. I mean real left progressive socialistic people.
People who cannot stand the betrayals handed out by the recent crop of Harry Reid, Nancy Pelosi, and Barack Obama. If it fails we all vote Democratic. But if it succeeds, we change the whole context of debate.
The Republican party was originally a progressive party - LONG ago
OP, your theory is good, but as the Rethugs rigged the their own primaries this year so Romney would win.
Which is why it will be necessary to take them by surprise.