Obama's Payroll Tax Cut

When the cut was first announced, I wrote that it seemed to pose a threat to Social Security. Now, a few of the Democrats, especially Bernie Sanders, seem to be picking up on the risk to Social Security. What would have stopped Obama from making it a tax rebate in which the treasury would not have to leave the fingerprint on the Social Security system. Besides, it could be targeted to people who made under x millions of dollars a year. Of course, really smart CEOs do not have to pay the tax. They can take a one dollar salary, then cash in stock options instead.