It’s still early, but at this point in the 2016 campaign, it’s not unreasonable to think that Hillary Clinton could cost the Democrats the Senate. Her campaign is not building any sort of wave or momentum that is producing a downdraft that could deliver the Senate majority to the Democrats. By most measures, the Democrats should retake the Senate in 2016. Republicans are defending 24 Senate seats, and the Democrats are defending only 10. Despite having a generally weak bench, the Democrats have done a pretty good job at candidate recruitment. But Clinton’s lackluster, dull and uninspiring campaign, not to mention the fact that Democratic candidates cannot vouch for her honesty, is depriving them of their chance. It’s not just a reading of the tea leaves — credible polling reveals that Republicans are in good shape in most of the Senate campaigns across the country as we head into the final 55 days of the campaign. As The Post’s Amber Phillips points out, based on recent NBC/Wall Street Journal/Marist polling, the Republican candidate for Senate is up by 19 points in Arizona, 15 points in Georgia, eight points in New Hampshire and two points in Nevada.