Don’t be too hard on the people of Pennsylvania. The election laws here are the reason Hillary won. Independents or third party people are excluded from the primaries. In other states if you are independent you can choose to vote on a ballot of your choice.
I showed up to my polling place and put up a stink because I am registered Green Party and wasn’t allowed to vote for Sanders. It pains me because I am going to have to turn my back on my party just so I can try to voice my opinion in the Democratic party.
If the rules were different then Sanders would have won.