Midgam conducted two scenario polls of 533 people with a 4.3% margin of error for Channel 13 that was broadcast on Dec 16 2018.
Scenario Poll #1: With Gantz leading a new party
Current Knesset seats in [brackets]
28 [30] Likud
16 [-–] Gantz Party
13 [11] Yesh Atid
12 [13] The Joint (Arab) List
10 [24] Zionist Union
09 [08] Bayit Yehudi
07 [06] Yahadut Hatorah/UTJ
06 [05] Yisrael Beitenu
05 [10] Kulanu
05 [07] Shas
05 [01] Orly Levy
04 [05] Meretz
00 [–-] Zehut, Yaalon, Yachad (as other) under 3.25% threshold
60 [66] Current Right-Religious Coalition
60[54] Current Center-Left-Arab Opposition
Scenario Poll #2: With Gantz joining Lapid
Current Knesset seats in [brackets]
29 [30] Likud
26 [11] Yesh Atid + Gantz
12 [13] The Joint (Arab) List
10 [24] Zionist Union
09 [08] Bayit Yehudi
07 [06] Yahadut Hatorah/UTJ
07 [05] Yisrael Beitenu
05 [10] Kulanu
05 [07] Shas
05 [05] Meretz
05 [01] Orly Levy
00 [–-] Zehut, Yaalon, Yachad (as other) under 3.25% threshold
62 [66] Current Right-Religious Coalition
58 [54] Current Center-Left-Arab Opposition
Additional Questions:
Are you pleased with the conduct of Benjamin Netanyahu as Defense Minister?
58% No, 33% Yes, 9% Don’t know
Are you pleased with the conduct of Moshe Kahlon as Finance Minister?
60% No, 30% Yes, 10% Don’t know
I don’t think Gantz can be considered left of centre. on these polls he’s in for defense minster in the next likud government and lieberman is out.