At Brookhaven, a retirement community in Lexington, women in their 80s and 90s play bridge and mahjongg, stretch their arms and legs in tai chi class, and eat low-sugar desserts to contend with their diabetes. But Brookhaven is also the epicenter of Grandmothers for Obama, an enterprising organization of more than 600 women nationwide that’s reaching tens of thousands of elderly voters in swing states this fall with carefully worded, hand-signed, hand-stamped postcards.
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