Based on all models, it is almost impossible that the Republicans don’t take the Senate. However with Republicans failure is always possible.
Unfortunately, we have seen too many failed Senate candidates the past two cycles. Even in 2010, we left 2-3 seats in Dem hands we should have won. Our side is having terrible failure in state-wide elections right now, at least for national seats. We are simply getting beat in media and grassroots when we account for the densely populated centers. We need some new talent to surface quickly in campaign strategists.