Cruz has continuously risen since the debates began, while Carson has dropped recently.
Via Right Scoop:
NBC News has a new nationwide surveymonkey poll out today, with a very large sample size of over 2400 that are Republican or who lean Republican, that shows Ted Cruz surging 8 points to second place into a tie with Ben Carson with 18%. Trump is of course still in first place with 28%.
The interesting thing about this poll is that we can see the history all the way back to April of this year, and in this new polling Cruz is higher than he’s ever been, especially as of late:

