That's because even Cruz supporters are (subconsciously) afraid that there might some truth to this story since it becomes more obvious every day that he is not quite the guy we were sold.
Or maybe it's because I'm not the only Cruz voter who is more interested in his voting record than his personal life. Plus a lot of Cruz supporters are Christian, who by definition reject the idea that anyone is "without sin." Powerful men fall into sexual sin all the time, and I know of no reason to think Cruz is immune to that.
OTOH, I've been around long enough to know that "guilty until proven innocent" is that way to go in most cases, and that "where there's smoke, there's fire," when said by a political enemy, is generally spin with no facts behind it. Political figures who fool around generally get caught with pretty compelling evidence as soon as someone makes a serious effort to get it.
Reporters and others have been looking for evidence that Cruz has fooled around since he was running for Senator, and no one's found anything solid yet. Rumors have been flying for the past few months, and still there's no credible evidence. That, to my mind, puts the odds in Cruz's favor.
OK, have you seen any denials yet ???