BC-US--Election 2020-Obama, 4th Ld-Writethru
FILE - In this Oct. 29, 2019, file photo, former President Barack Obama speaks during the Obama Foundation Summit at the Illinois Institute of Technology in Chicago. Obama reiterated a warning about the adoption of “purity tests” in the Democratic presidential primary, which he said are likely to alienate voters needed to defeat President Donald Trump next year. (Ashlee Rezin Garcia/Chicago Sun-Times via AP)
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