20 House races just moved toward the Democrats, Cook Political Report predicts

President Trump's dismal polling numbers are having down-ballot consequences.

Multiple national polls over the past days and weeks have given former Vice President Joe Biden a double-digit advantage over Trump this fall. The Cook Political Report says those results "are seriously jeopardizing down-ballot GOP fortunes," leading it to move 20 House races toward Democratic candidates in its largest one-way shift in a long time.

That doesn't mean Democrats are favored to win all of those races. Cook's prediction softens the chances of a dominant victory in several formerly hard-right districts, while all but guarantees a Democratic victory in others. Four races where a Republican incumbent was favored to hold their seat meanwhile moved into toss-up territory, including Democrat Wendy Davis' challenge to Rep. Chip Roy (R) outside San Antonio, Texas.

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Republicans need to win 18 seats to regain their majority in the House, but with this latest shift, it looks less and less possible.