Now you'll see they polled 1463 democrats, 1086 republicans and 370 independents for a total of 2919 people. As you can see over 50% polled were democrats and a paltry 12.6% independents were polled.
Now according to gallup party affiliation here http://www.gallup.com/poll/15370/party-affiliation.aspx only 31% of people identified as democrat when the poll was taken yet 50% of the people being asked who they would vote for identified as democrat. So democrats were severely oversampled. Then look at the independents. 36% identified as independent but only 12.6 of those polled were independent. So they oversampled Democrats by the same amount they undersampled independents.
There is your proof the polls were/are rigged. Case closed now.
I think that you need to go read all the articles on the 538 site on how polls were skewed, biased, and were mis-represented while suffering from sampling issues.