For the lion's share of retirees, Social Security is much more than just some check they've earned through decades of work. Rather, it's a crucial source of income that helps anywhere from 80% to 90% of current retirees make ends meet, according to more than 20 years of surveys conducted by national pollster Gallup.

However, the program paramount to retirees' financial well-being finds itself on ever-shakier ground.

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Source Fool.com