Cook Political Report: “With an increasingly sour national environment for Republicans, the Senate battlefield is shifting in Democrats’ favor. But due to the difficulty of the map, winning back a majority still remains a tall order. The GOP remain the narrowing favorites to retain the upper chamber. However, that outlook could change in the coming months.”

“We are shifting four ratings, all in Democrats’ favor. Two seats move out of the Toss Up column to Lean Democrat — the open Republican seat in North Carolina, which represents a net pickup for Democrats, and Sen. Jon Ossoff’s seat in Georgia, where a messy GOP primary still reigns as the incumbent continues to stockpile cash.”

“Ohio, where even recent GOP polling has shown former Sen. Sherrod Brown in a statistical tie with appointed GOP Sen. Jon Husted, shifts from Lean Republican into the Toss Up column.”

“One seat moves from Solid Republican to the periphery of the battleground map into the Likely Republican column: Nebraska, where independent Dan Osborn is back again, this time challenging wealthy Sen. Pete Ricketts.”