One lewd tape of Donald Trump bragging 11 years ago about assaulting women and getting away with it has upended a year of carefully laid Republican strategy to keep control of Congress.
Just days ago, Senate Republicans were growing more confident that they had built strong enough campaigns to pull out victories even if Trump loses in November. But after the widespread outrage over Trump's sexually aggressive remarks, it is suddenly unclear whether they could ever insulate themselves enough from the man at the top of their party's ticket.
Even House Republicans, who should be able to hold onto their majority, are now concerned that Trump's toxicity could shrink their margin significantly in that chamber too.