They see themselves as Republicans or Democrats, and they really aren't sure what that entails but they know that there are organizations called the Republican Party and the Democrat party, and these respective parties will tell them who to vote for.
The party does the thinking so the voter doesn't have to.
Its clear that neither party is supporting Ron Paul much, so to these people the Good Doctor is kind of an unknown quantity and to be avoided.
More intelligent voters and those willing to open their eyes support Doctor Paul. But the Party Sheeple described may never support him unless their party does.