Former Vice President Joe Biden is set to launch a presidential campaign on Thursday, sources told CNN on Tuesday. Biden has been publicly hinting at a 2020 run for weeks, and has even begun encouraging donors to contribute to campaign operatives. He sits near the top of many national polls, and is expected to become the Democratic frontrunner upon entering the race. "The theme for the announcement is going to be 'the battle for the soul of America,'" one source said of Biden's campaign launch, which will come in the form of a video on Thursday and an event in Pittsburgh on Monday.
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