you seem not to understand. It doesn't matter how the woman's vote breaks down or how the Hispanic or even the white vote breaks down. They are all included in the numbers. The reason the Democratic base or party affiliation to use the June figures is at 28% is because there are more women, more hispanics, more blacks, etc in that 28% figure than whites. It doesn't matter if 90% of the 24% of the Republican affiliation is white, black, purple or green, they simply make up 24% of the electorate. The demographics are included or what makes up the total for each party.
In 2012 President Obama received 51% of the total vote, look at my chart 35% of the electorate identified as Democrat, that 35% included all the women, all the blacks, all the Hispanics and Asians, along with whites who said they were Democrats. The independent lean democrat of 16% included all the women, all the blacks, all the Hispanics and Asians, along with whites who said they were independents but leaned towards when it comes time to vote the Democratic Party.
Romney received 59% of the white vote, 27% of the Hispanic vote, 6% of the black vote and what ever percentage of Asian and women and men, but they are all included in the 30% who identified themselves as Republicans and the 12% who lean Republican.
When using party identification/association the demographics are already included in that identification/association. What Gallup is doing is counting up everyone regardless of sex, race, etc that state they identify with one party or the other. They do the same with independents but asked them which party do they tend to lean towards. Again without regards to sex, race, etc.