The former congressman looks certain to be the Democratic nomination but faces a battle to unseat the GOP incumbent.
However, Paddy Power said that the chances of a Republican winning the Texas Governor's race are far greater, and listed the odds of the winner being a GOP candidate at 1/6.
"O'Rourke will be desperate to avoid a hat trick of losses, having already failed in his recent bids for theand the White House. But despite the big orange fella [Donald Trump]'s endorsement of Abbott worrying some Republicans, the national picture coupled with an unpopular sitting president make it an uphill battle for O'Rourke."
The survey also appeared to suggest that both candidates will be the selected primary candidates for the GOP and Democrats. "Both of them, I think, have substantial leads over any other people within their respective parties."