Low information voters…..
Check it out:

Kansas’ 2014 race for Senate may be one studied by political scientists for decades to come. For now, it looks as if it’ll be a case study in how low-information self-identified independents think the partisan ID next to a candidates name matters more than anything else.

A background: a lot of research has shown that self-identified independent voters and swing voters are only in the middle of the political spectrum because they’re low-information voters.