"Disappointment does not begin to describe," he wrote.
The long-time senator's race against Rep. Ann Kirkpatrick could be his closest.
"It feels like heaven," Kellyanne Conway tweeted.
The former Joe Heck aide said Catherine Cortez Masto was pandering to Hispanics.
Clinton shared an April tweet by Cruz calling on Trump to release his tax returns.
Trump said in July, "if he gives it, I will not accept it."
Charlotte has faced civil unrest this week after a black man's fatal police shooting.
She said if Cruz were her man, he would be "sleeping on the damn couch."
Clinton leads ahead of the first debate Monday.
Eighteen percent said the same of Hillary Clinton.