President Donald Trump's urging of Ukraine to investigate Joe Biden signaled he views the former vice president as his biggest threat in 2020. But he made a huge miscalculation, and risked impeachment in the process. It's true Biden is still at the top of a number of major national polls, but Sen. Elizabeth Warren is rapidly catching up to him and he's essentially frontrunner in name only. Polls have also consistently shown Trump would lose in a head-to-head matchup with top Democratic candidates other than Biden like Warren and Sen.

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