The Cook Political Report on Friday updated its rating for Texas's heated Senate race, moving it from "leans Republican" to "toss-up" amid new polls showing 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) in a tightening race with Sen. Ted Cruz Rafael (Ted) Edward CruzCruz blocks amended resolution honoring Ginsburg over language about her dying wish Trump argues full Supreme Court needed to settle potential election disputes Press: Notorious RBG vs Notorious GOP MORE (R).

The change in rating Friday came amid two other Senate race changes, with the prediction website changing the race for Sen. Jon Tester Jonathan (Jon) TesterDemocrats shoot down talk of expanding Supreme Court Pence seeks to boost Daines in critical Montana Senate race This World Suicide Prevention Day, let's recommit to protecting the lives of our veterans MORE's (D-Mont.) seat from "likely" to "leans" Democratic, while the West Virginia Senate race moved from "toss-up" to leaning in favor of incumbent Sen. Joe Manchin Joseph (Joe) ManchinManchin defends Supreme Court candidate Barrett: 'It's awful to bring in religion' The Hill's Morning Report - Sponsored by Facebook - Trump, GOP allies prepare for SCOTUS nomination this week Trump meets with potential Supreme Court pick Amy Coney Barrett at White House MORE (D).

Three Senate ratings changes today: #MTSEN: Likely D to Lean D ⇨#TXSEN: Lean R to Toss Up ⇦#WVSEN: Toss Up to Lean D ⇦



Full chart: https://t.co/qKOWMf9b82 pic.twitter.com/U25Rq8Kgbu — CookPoliticalReport (@CookPolitical) September 21, 2018

Cook's authors did not immediately give any explanation for the ratings change, but the move follows a series of polls showing Cruz with a small single-digit lead over his insurgent opponent, who has outraised Cruz by millions since the campaign began.

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A survey by left-leaning pollster Public Policy Polling found Cruz with just a 3-point lead over his opponent on Thursday among registered Texas voters. A Reuters–Ipsos poll the day before found O'Rourke with a 2-point lead.

“There’s a possibility it could happen. I’m not saying probable. But it’s possible,” Larry Sabato, director of the University of Virginia's Center for Politics, told Reuters of O'Rourke's chances in the Reuter's poll release Wednesday.

An average of polls of the Texas Senate race produced by RealClearPolitics shows Cruz with a 4.5-point lead over O'Rourke.

O'Rourke is set to hit the campaign trail with Texas Rep. Joaquin Castro Joaquin CastroFlorida Democrat asks FBI to investigate anti-Semitic, racist disinformation Hispanic Caucus members embark on 'virtual bus tour' with Biden campaign Hispanic caucus report takes stock of accomplishments with eye toward 2021 MORE (D) and his brother, former Secretary of Housing and Urban Development Julián Castro, according to a press release, following polls that showed him with an insufficient lead over Cruz among Hispanic voters.

The two Senate candidates are scheduled for their first debate on Friday.