WASHINGTON – Note to soon-to-be-former Gov. Sarah Palin: Big girls don’t quit.

Just ask Hillary Clinton. Crying – or at least misting up a little – you can get away with these days. But quitting? Not until you absolutely have to, and even then you might hold on for a few extra weeks.

Just ask Serena Williams, or, more to the point, her older sister Venus. Their first set in the Wimbledon women’s final Saturday went to a tie-breaker, which Serena won. But even when she was down 5-2 in the second set, Venus battled back against three match points only to lose on the fourt...

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