Dominionism isn't a denomination. It is an ideology/theology, so you can be a Baptist, Methodist, whatever, and hold to it. That said, I've never seen a single news article ever associating Ted Cruz with attendance at Second Baptist Church in Houston. I did a google search and all I got was: "second baptist high school".
After returning to Houston in 2008, Cruz and his wife Heidi
began attending Houston’s First Baptist Church.
https://www.tedcruz.org/news/ted-cruzs-pastors-speak-out-about-his-faith/