WASHINGTON — On the eve of the midterm elections, oddsmakers lay out the probability for candidates and their chances of winning.

The latest predictions from FiveThirtyEight, a political forecasting website, give Democrats about an 85 percent chance of winning the House and Republicans have an 83 percent chance of winning the Senate.

In the race for U.S. Senate in Texas, incumbent Republican Sen. Ted Cruz has nearly a 77 percent chance of being re-elected in his race against Democrat Beto O'Rourke, according to FiveThirtyEight.

“If every eligible voter in Texas turned out, that could be a very close race,” editor-in-chief Nate Silver said during an interview with George Stephanopoulos before early voting. “If not, you could see [O’Rourke] getting 47, 48 percent. You need 50 to win, and it is still a very red state.”

On Sunday, Silver tweeted that if polls are "exactly right," O'Rourke will lose by about 5 points, despite Democrats turning out a lot of voters in Texas.

If polls are exactly right:

—Beto will lose to Cruz by ~5 points.

—Ds will win 1-2 House seats (most likely candidates are TX-7, TX-32, TX-23) that they probably wouldn't have otherwise.

—Ds will turn out a lot of voters for the first time in a state with 36 electoral votes. — Nate Silver (@NateSilver538) November 5, 2018

Most oddsmakers agree the House will go to the Democrats and Republicans will maintain control of the Senate, including Cruz.

Betting sites, such as Bovada and MyBookie, have O'Rourke, an El Paso congressman, as a longshot. Sports Betting Dime gives him 4-to-1 odds of becoming the first Democrat to win a statewide election in Texas since 1994.

The betting site also puts the over/under for voter turnout in Texas at 30 percent this year. Only 28.5 percent of eligible Texans voted in the 2014 midterms, which saw the lowest turnout in 70 years.

After early voting closed Friday, more than 4.8 million people had cast ballots — about 30 percent of registered voters.

"If people keep turning out at the rates that we've seen, I'm confident that we will win," O'Rourke said Monday.

Across the country, more than 35 million ballots were cast during early voting, surpassing the 21 million cast in 2014.