The Associated Press reports:
It’s come to this for Republicans straining to defend their Senate majority in November’s elections: They’re air-dropping millions of dollars into races in Alabama, Kentucky and other red states where Donald Trump coasted during his 2016 presidential election triumph. This year, challenged by Trump’s fumbled handling of the coronavirus pandemic, the crippled economy and his racially inflammatory stances, Republicans face potentially competitive races they’d normally have locked down.
Democrats have at least a puncher’s chance of grabbing Republican-held seats in four states Trump won by double digits: Alaska, Kansas, Kentucky and South Carolina. They have an even shot at ousting GOP Sen. Steve Daines in Montana, which Trump carried by 20 percentage points, and long-shot hopes of retaining their most endangered senator, Doug Jones of Alabama, where Trump won by 28 points.
There’s a state-by-state analysis at the link.