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https://live-production.wcms.abc-cdn.net.au/6a33f634cbed52eedf52587da93b4159?impolicy=wcms_watermark_news&cropH=1521&cropW=2704&xPos=0&yPos=0&width=862&height=485&imformat=genericA day after a prime-time press conference that gifted his opponents two highly shareable gaffes, Joe Biden travels to Michigan and makes light of complaints about his age.