If you judged by the more than 16,400 comments posted on a federal government website, you’d think there was a groundswell of older Americans demanding that federal officials hike payments to their Medicare Advantage health insurance plans.  Yet about 82% of the comments are identical to a letter that appeared on the website of a secretive advocacy group called Medicare Advantage Majority, a data analysis by KFF Health News has found.  The “dark money” group does not reveal its funders or much else — other than to say it is “dedicated to protecting and strengthening Medicare Advantage” a...

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