Tim Canova, who won attention for his challenge against the then-Democratic National Committee leader in 2016, had been running in the Democratic primary until the Monday announcement.

While Wasserman Schultz remains the heavy favorite in the solidly Democratic district, the decision could lead to a contested three-way race for the South Florida seat if Canova gains steam.

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Canova said he was leaving the Democratic Party because it had "screwed over" progressive candidates.