I doubt it,
I could almost agree with you if they polled by geographical area, work status, and religion.
I am pretty sure they do, at least any reputable polling firm would. (Age, Sex, Income, Race, Education, Region, and city/suburban/rural).
The problem with weighting by party affiliation is that it is the primary things you’re trying to measure: namely people’s political preference. When you weight it by a predetermined amount then you’re basically diluting the data with your predetermined outcome.
The reason a lot of pollster do it is because they are not confident in their demographic sampling being good enough, so they weigh it by certain factors so they can stay in line with other pollsters.
Gallup must feel confident enough in their sampling that they feel whatever party affiliation that comes out of their sample actually captures the true party preference of the population and therefore additional weighting is not necessary.