Dick Morris: Blanche Lincoln (D-AR) and Olymbia Snowe, a Maine Republican, are set up to play a critical role in the health care outcome. How they vote will determine how Congress goes on Obamacare. Lincoln is perhaps the most vulnerable Senator up for re-election next year. If she votes for Obamacare, other moderates will follow her. But can she afford to alienate her senior constitutents and vote to chop Medicare?