Sabato's Crystal Ball is projecting that Democrats will comfortably win control of the House during Tuesday's midterm elections, while Republicans will slightly expand their majority in the Senate.

The election handicapper warned Monday, however, that upsets in both chambers are possible.

The forecaster also projected Democrats will cruise to a number of victories in gubernatorial races across the country.

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In the House, the final ratings from the University of Virginia's Center for Politics have 229 seats that are at least leaning Democrat and 206 leaning toward Republicans. The forecast projects Democrats will pick up 34 seats, 11 more than they need to regain control of the lower chamber.

Kyle Kondik and Larry J. Sabato, the editors of the forecast, write in their projections that the House isn't a "done deal" for Democrats — but also cautioned that they could be underestimating the party's gains.

"We don’t think readers should be stunned if things go haywire for Democrats tomorrow night. That said, it may be just as likely — or even more likely — that we’re understating the Democrats in the House," they write, adding that Democrats could actually end up gaining between 35 and 40 seats.

The forecasters note that Republican Reps. Don Young Donald (Don) Edwin YoungFlorida Democrat introduces bill to recognize Puerto Rico statehood referendum House Democratic campaign leader predicts bigger majority Young wins Alaska GOP House primary MORE (Alaska), Duncan Hunter Duncan HunterDCCC reserves new ad buys in competitive districts, adds new members to 'Red to Blue' program Wife of former Rep. Duncan Hunter sentenced to 8 months of home confinement Harris endorses Democrat in tight California House race MORE (Calif.), Steve King Steven (Steve) Arnold KingTrump, Biden deadlocked in Iowa: poll GOP leader: 'There is no place for QAnon in the Republican Party' Loomer win creates bigger problem for House GOP MORE (Iowa), Greg Gianforte Gregory Richard GianfortePence seeks to boost Daines in critical Montana Senate race On The Trail: How Nancy Pelosi could improbably become president Supreme Court denies push to add Green Party candidates to Montana ballot MORE (Mont.) and Chris Collins Christopher (Chris) Carl CollinsConspicuous by their absence from the Republican Convention NY Republican Chris Jacobs wins special election to replace Chris Collins 5 things to watch in Tuesday's primaries MORE (N.Y.) all face potentially difficult reelection bids in races that would typically be seen as safe reelections.

In the Senate, the final ratings have 52 seats at least leaning Republican and 48 at least leaning Democrat, meaning the forecast projects the GOP will expand its current 51-49 majority by a single seat.

Kondik and Sabato write that an upset in the Senate is still possible, but note that Democrats would likely need to win every seat where they are currently favored in addition to holding onto both Indiana and Missouri and winning one of North Dakota, Tennessee or Texas.

The forecasters say they have been "flooded with messages from credible contacts in Texas, from both sides of the aisle," warning them not to discount the possibility that Rep. Beto O'Rourke Beto O'RourkeJimmy Carter says his son smoked pot with Willie Nelson on White House roof O'Rourke endorses Kennedy for Senate: 'A champion for the values we're most proud of' 2020 Democrats do convention Zoom call MORE (D) could defeat incumbent Sen. Ted Cruz Rafael (Ted) Edward CruzTrump argues full Supreme Court needed to settle potential election disputes Press: Notorious RBG vs Notorious GOP The Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy MORE (R).

"The energy on O’Rourke’s side, they say, is palpable. This all may be reminiscent of the grassroots energy that helped power Trump himself to victory in 2016. Of course, analysis by anecdote isn’t always the right formula," they write.

In the gubernatorial races, the forecasters project that Democrats could net 10 governorships, which would result in the party holding a majority of the governor's mansions in the country. Currently, Republicans make up 33 of the nation's governors, Democrats hold 16 and an independent, Gov. Bill Walker, holds Alaska.

The prediction model rates the closely watched race in Georgia between Democrat Stacey Abrams and Republican Brian Kemp as a "toss-up/leans run-off." The two would face off again on Dec. 4 if neither gets a majority of the votes.