You can go to the 2/18 Gallup poll itself to see the breakout to make a bit more apples to apples.
In that Gallup poll before Yang’s campaign it was 65% favorable/35% unfavorable among Democrats and 48%/52% among Independents.
The current Emerson 53% favorable number is just likely Iowa Democratic caucus goers.
Still different varieties of apples but more consistent with a LOSS of support for the idea since Yang than an increase.
Looking at the Hill/HarrisX September poll among Democrats it was 66% favorable and Independents ran 48% Favorable - up from their 2/19 poll, less than the newest Emerson results, and on par with Gallups 2/18 numbers.
It would be a bit insane to look at the Emerson number and claim that he’s moved the needle an insane amount on this.