The extent of the rescue effort remains open. While a Pro Cruz Super PAC, Texan's Are, has been established, other conservative outside groups have focused on other Senate competitions. But with the club's push into the Texas race, more national Republican groups can judge whether they support Cruz.
The White House has meanwhile monitored the competition. Two high-ranking Republicans said they were expecting President Donald Trump, who fought bitterly with Cruz during the presidential race in 2016 to find the way for the Republican ahead of the November elections.
McIntosh said it would not be decided on the club's election campaign. But he said it would focus heavily on staging O Rourke as an establishment figure who, unlike the non-political and outsider he cultivated, seeks to scale the ranks of political power.
The Club for Growth has long been supportive of Cruz. During his first Senate in 2012, the organization spent more than $ 5.5 million on his candidacy and borrowed another $ 922,000 for him. But the Club for Growth did not run any major publicity campaigns during the parliamentary elections when Cruz easily defeated Democrat Paul Sadler by 16 percentage points.
For some Cruz supporters, the help can not come fast enough, and many of them are eager to see Cruz's donor network, which he forged during his presidential campaign in 2016, enabled for his re-election.
"I do not think you can count anyone at any point, this world is changing so fast, it's pretty incredible," said Lee Roy Mitchell, a Dallas-based Cruz dispenser and founder of the Cinemark cinema chain.
"We stand firmly behind the Senator, and I would like to think that most are Texans, I think they are," said Mitchell, who along with his wife Tandy, donated $ 1 million to the pro-cruz super -PAC has donated. "But a tremendous amount of money is poured in here to change people's opinions."