Senate Republicans’ strangely uneven spending map

Senate Republican spending is heavily concentrated in just a handful of races — a distribution that doesn’t match the reality of the battleground map.

That dynamic is the result of poor fundraising from some key candidates and the party’s reliance on fickle big donors to close the gap. The playing field is ripe with inviting targets, but the advertising from the GOP and its allies is heavily lopsided instead of spread across them. And some of the places where they’re more involved are not the most obvious pickup opportunities.