'Oh my, oh my': Data expert staggered by GOP-leaning group's devastating Trump abandonment

President Donald Trump's deepening unpopularity is dragging down Republican chances with crucial swing voters, according to CNN's Harry Enten.

The 79-year-old president remains underwater in public opinion polling with most demographic groups, and Enten told "CNN News Central" that he's struggling with a key voter bloc that Republican congressional candidates will need in November.

"Who are the people who are dragging down President Trump's approval rating?" Enten said. "We are talking...