Political prognosticators suggest Democrats have major momentum on the eve of the midterms

Democrats' chances of making major gains in the House are looking better than ever.

On Monday, the Cook Political Report moved nine House races towards the Democrats. This includes Pennsylvania's 10th District, where the race between incumbent Republican Rep. Scott Perry and Democratic challenger George Scott has moved from "lean Republican" to "toss-up." Polls in this race have shown Perry with a very slight edge over Scott.

Meanwhile, the race in Georgia's 6th District has also become a toss-up after previously being listed as "lean Republican." This is the race between Republican Rep. Karen Handel and Democrat Lucy McBath — a recent New York Times survey gave McBath a two-point advantage.

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In two other races, the Cook Political Report still favors the Republicans but now predicts that Democrats have a better shot: both Florida's 25th District and Michigan's 6th District have moved from "likely Republican" to "lean Republican." Those two districts are currently represented by Republicans. Washington's 8th District, where an incumbent Republican is vacating his seat, has also moved from toss-up to "lean Democratic."

On the eve of the election, the Report has listed 28 seats as likely or leaning Democratic, and 30 as toss-ups. Democrats, who now have a 13-point lead on the generic congressional ballot, need only end Tuesday night with a net gain of 23 seats in order to take control of the House. Still, some forecasters are warning that the so-called blue wave is far from certain, with FiveThirtyEight's Nate Silver noting that Republicans keeping control of the House is still "extremely possible."