Former Vice President Joe Biden has begun tip-toeing towards throwing his hat in the ring as a candidate in the 2020 Democratic Presidential Primary.

Political watchers are expecting him to formally announce any day now. But Biden, who carefully cultivated a genial “Uncle Joe” image during his eight years as Obama’s veep, knows he’s got a history that could drag him down. Few politicians have done more harm in America’s war on drugs than the former senator from Delaware.

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