"More interested" in something else does not equal "don't care." Cruz's voting record comes first, and I will dig pretty deeply to track that down. OTOH, I'm not going to question his "public persona" and go digging to see if he's different in his "personal life." The Cruz fans I know all believe the Bible is correct when it says "put not your faith in Princes" and when it teaches that only God knows a person's heart. Voting for a political candidate is like loaning money to friends or family -- you hope for the best, but prepare for the worst.
If I highly prioritized a candidate's personal life, I would never have been willing to "hold my nose" and vote for Trump if he's the Republican candidate. Someone who proudly brags about his adulteries and says he has no reason to ask forgiveness (definitely Trump) is far more morally offensive to me than a guy who upholds family values in public and falls into sin in private, but still publicly calls it sinful and wrong (potentially Cruz). One guy actively endorses a lifestyle that damages people, the other doesn't.