You just wait until a real leftest is elected president and does what he promises to the base. Obama seemed like that kind of guy but he turned out to be a lot more Bush like than left masses imagined. Once a real leftest is elected the stock market will move much much lower. The DOW will fall to under 7000 and the S&P 500 to under 800.
Obama is very similar to Bush policy wise. Rhetoric and talk are a different story however.
Once the corporate elite lose their influence, all the business friendly policy will stop and the bull market in stocks will certainly end. Corporate profit margins are at all time highs and corporate earnings are the highest percentage of GDP ever. If big labor can come back and they should before long with lots of friends in Congress and future administrations, corporate profit margins will begin a long term trend down and wages a long term trend up. The P/E will sink far below current levels and the rising wages will be used to pay off debt and the stock market bulls will be in a world of big trouble. If this does not happen, a deflationary bust is likely and far worse. Stocks will be huge loser from current levels with both outcomes.