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US Senate candidate Rep. Beto O'Rourke, a Texas Democrat.
- Control of the Senate will be determined in next Tuesday's midterm elections - and there are several races that could go either way.
- While pollsters predict Democrats will flip the US House in next week's midterm elections, they say chances are much slimmer that the "blue wave" will reach the Senate.
- Here are nine Senate races to keep an eye on next week.
Control of the Senate will be determined in next Tuesday's midterm elections - and there are several very competitive races to watch.
Democratic incumbents in 10 states that President Donald Trump won in 2016 are facing tough reelection contests. Meanwhile, Democrats are also facing uphill battles in red states where they hope to pick up seats, including Arizona, Nevada, Texas, and Tennessee.
Nate Silver of FiveThirtyEight predicted on Thursday that Democrats have a 15% chance of flipping the Senate and asserted that Democrats would need "some type of systematic polling error to win the Senate."
While Democratic leadership remains bullish on flipping the upper chamber, many operatives are less optimistic. And Trump announced this week that the so-called Democratic "blue wave" is "dead," expressing confidence that the GOP will maintain its hold on the Senate.
"I think we're doing very well ... I think we'll win the Senate, and I think we're gonna do well on the House," Trump told the Christian Broadcasting Network on Wednesday.
Read more: SENATE BATTLEGROUND MAP: The race for control of the Senate is as tight as it can be