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-Texas) has a nine-point edge over opponent Rep. Beto O’Rourke (D-Texas) in the Lone Star State’s Senate race, according to a new Quinnipiac University poll released Tuesday.

About 54 percent of likely Texas voters in the sample support Cruz, compared with 45 percent who support O’Rourke.

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While both have net-positive favorability ratings, Cruz’s margin is greater than his opponent’s. About 52 percent of likely voters surveyed have a favorable opinion of Cruz, compared to 43 percent who have an unfavorable opinion. Roughly 43 percent of likely voters polled have a favorable opinion of O’Rourke, whereas 42 percent have an unfavorable opinion.

The upcoming midterm cycle is largely considered to be a referendum on President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE. Likely voters in this poll are split 49-49 on the president’s job approval.

Cruz's 9-point edge in the poll differs from other recent surveys, which have O’Rourke only down 4 to 5 points. Republicans have grown increasingly concerned about Cruz holding on.

White House budget chief Mick Mulvaney Mick MulvaneyOn The Money: House panel pulls Powell into partisan battles | New York considers hiking taxes on the rich | Treasury: Trump's payroll tax deferral won't hurt Social Security Blockchain trade group names Mick Mulvaney to board Mick Mulvaney to start hedge fund MORE told Republicans at a closed-door meeting earlier this month that Cruz could lose his seat, citing problems with his likeability, according to The New York Times.

“I don’t think it’s likely, but it’s a possibility. How likable is a candidate? That still counts,” he said.

Should Texas become more competitive, it would open up a Senate map for Democrats that largely has them playing defense. Ten Democratic senators are running for reelection in states Trump won in 2016.

An average of polling for the Texas Senate race tabulated by RealClearPolitics shows Cruz up by 4 points. The Cook Political Report rates the race as “Lean Republican.”

Quinnipiac University surveyed 807 likely Texas voters from Sept. 11-17. The poll has a margin of error of plus or minus 4.1 percentage points.