It's not a small issue. It goes to the character of Cruz's campaign staff and "win at all costs" being accepted behavior. What folks are voting against this year is politics as usual.
Give it a rest you are fixated on a insignificant false fact, there has been many post that a Carson Campaign manger leaked it to Cruz who just repeated it. Try a FR search.
http://www.breitbart.com/big-government/2016/02/04/ted-cruz-voicemails-ben-carson-exclusive-audio/