MINYANVILLE ORIGINAL Stocks are set to rise today as Americans head to the polls to choose their next president.   The last polls show President Barack Obama leading Mitt Romney in the main battleground states. New York Times blogger and statistician Nate Silver gives the president a 91.6% chance of winning.   For the markets the margin of victory and the balance of power in Congress matters a lot. Jim Reid a London-based strategist for Deutsche Bank (NYSE:DB) told Bloomberg news “The worst-case market scenario is likely to be a narrow Obama victory where a bruised Republican party has enough ...