Where did this idea of 65+ mya radiocarbon come from?!?!?

Probably some silly creationist distortion of Schweitzer's actual discovery. Let's let her speak for herself (from PBS' NOVA):

Schweitzer: "I can't make any claims for those structures that appear to be like their modern counterparts until the chemistry reveals whether they are molecular remnants of the original structures, even if altered greatly, or if they are some kind of microbial pseudomorph or even some kind of as yet unknown biogeological process unrelated to structures or molecules produced by the dinosaur itself. If, for example, I were able to isolate those round red structures in the vessel and analyze them separately, and if I were to see any signals that are consistent with heme or hemoglobin, I would be much more likely to believe they are related to the dinosaur cells and proteins. For right now, I am assuming they are not. They are pretty intriguing tho, aren't they?"