When has Cruz been above 50%? Sheesh! If you take 100% of Rubio’s support, 100% of Carson's support, a smidgeon of Christie's support, Cruz will win. No wonder the Republicans don't know how to pass a reasonable budget.
Both men, Trump and Cruz have had significatn wins, by large margins and where they either beat 50% or got very close.
The four highest Trump wins are:
MA - 50.5%
NV - 46%
AL - 44%
HI - 44%
The four highest for Crus are:
WY - 71%
KS - 48%
ID - 47%
TX - 45%
I believe both men are going to be more than capable of getting over 50% of the vote if it comes down to them facing off one on one. Trump in some, Cruz in others.