By the numbers: In North Carolina, the most expensive Senate race this year, Democratic groups have outspent Republicans $116 million to $78 million.

Democrat Cal Cunningham was leading incumbent Thom Tillis by 6 percentage points in the average of polls tracked by Real Clear Politics — though that data was compiled before reports of texts between Cunningham and a woman who’s not his wife.

In Iowa, incumbent Joni Ernst has been collectively outspent by groups supporting Democrat Theresa Greenfield, $87 million to $66 million, with polls giving the challenger a slight lead.