Bannon’s civil war could undercut the GOP’s top 2018 advantage

Beyond dividing the party and creating more distrust between the White House and Senate Republican leaders, the problem with this Bannon/Breitbart campaign is that the Senate battlefield is perhaps the GOP’s top strength this midterm cycle, with Republicans having just nine seats to defend versus 25 for the Democrats. And that strength could now be at risk.

As the Cook Political Report’s Jennifer Duffy observes, “GOP primaries against incumbents are the only way Democrats can win a majority” — with Democrats needing to pick up three seats to win back the Senate.