I wouldn't have much faith in any poll at any time by so-called "independent" voters.
The reason they're "independent" is because they're too wishy-washy to take sides and make a definitive choice, either way.
Like the waving wheat of Kansas, they first blow in one direction, then the other, propelled by the wind without any core beliefs or principles.
Here today.
Gone tomorrow.
And their political "commitments" are nothing but a memory.