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A new Quinnipiac University poll shows incumbent Republican Sen.

Beto O'Rourke makes a point during a televised debate with Ted Cruz.

"With a week to go, Texas U.S. Sen".

But Cruz maintains a slight advantage, in part to a "gender gap", Brown said: Male voters prefer Cruz over O'Rourke at a 56 percent to 39 percent margin, while female voters prefer O'Rourke over Cruz at just a 52 percent to 45 percent split. Quinnipiac's previous poll two weeks ago showed O'Rourke trailing Cruz by 9 points, seemingly having lost his momentum after a series of polls in September showed him trailing in the low single digits.

O'Rourke led 56 percent to 40 percent among independent voters and 96 percent to 2 percent among Democrats.

At the end of the previous fundraising period - September 30 - O'Rourke and Cruz had raised a total of $89.9 million, with O'Rourke responsible for roughly two-thirds of that, according to a Texas Tribune analysis.

Cruz's comparative dominance among men is key, according to Brown.

Three percent of those surveyed are undecided and only 2 percent of those who did express a preference said that they could change their minds before they voted.

President Donald Trump and Vice President Mike Pence are among those who have traveled to Texas to campaign on Cruz's behalf.

This Quinnipiac survey was conducted October 22-28, reaching 1,078 likely Texas voters on landlines and cellphones.

Early voting in the November 6 election runs through Friday.