How many people, beside Dingy Harry, even know who the Koch brother are, or can care less?
brothers
Thats just it, it’s incredibly hard to make an election revolve around a specific individual (or, in this case, brothers) other than the President.
The Dems should have learned this lesson with their 1990s attempts to focus on Newt Gingrich, or going after Rove 10 years or so ago. The GOP certainly DID by not focusing on Pelosi or Reid or Soros. Once you move beyond the President, no one really cares to know (let alone vote on) who the players in the political sausage factory are.
The only way a bogeyman like the Koch’s help is in sucking donations out of the already well-motivated side of the base. Thats really about it.
The same applies to issues. The Dems lost a CO Senate seat by trying to make the election all about the tired old War on Women meme. With the result that even supporters were deriding their incumbent as “Senator Uteris”