Ted Cruz is like this bouncing ball in 3 most recent Iowa polls

Source:  Real Clear Politics

The behinders in the 12/18-21 Gravis Marketing poll:

• 4% - Jeb Bush, Mike Huckabee
• 3% - Carly Fiorina
• 2% - Chris Christie, John Kasich
• 1% - George Pataki, Lindsey Graham
• 0% - Rick Santorum

Recent Iowa caucus posts: 
Donald Trump, Ted Cruz remain in seesaw battle for 1st in Iowa; Jeb Bush quietly re-emerges.  (12/15/2015)
Trump and Cruz duke it out for 1st in latest Iowa caucus poll.  (12/14/2015)
Ted Cruz surges to 10-point lead.  (12/13/2015)
Snatchin' it back: In one day, Cruz goes from 5-point lead to 13-point deficit in Iowa.  (12/7/2015)
Ted Cruz snatches the lead from Trump in Iowa; Carson tanking.  (12/7/2015)
Cruz makes a move to overtake Trump in Iowa; Carson continues to fade.  (11/24/2015)
Based on latest Iowa poll, Trump can say anything he wants, Carson not so much.  (11/22/2015)
It's presently a 4-way contest in Iowa.  (11/8/2015)
In latest Iowa poll, Carson falls off a cliff, Cruz continues steady climb.  (11/3/2015)
This just in: Marco Rubio does NOT have 'all the magic fairy dust'.  (11/1/2015)