Officials in both parties believe that the two Republican seats most likely to change hands are in Wisconsin and Illinois. Mr. Burr, who has endorsed Mr. Trump, and Mr. Toomey, who has not, face a similar dilemma. They must determine how to retain Mr. Trump’s ardent supporters without embracing him, handing Democrats easy fodder and repelling independents. The situation is far more manageable in those states where Mr. Trump is more competitive. Mr. Trump’s standing has collapsed in the vote-rich Philadelphia area, helping Mr. Toomey’s challenger, Katie McGinty, establish a narrow edge in public polls.

Source: New York Times August 18, 2016 22:43 UTC