Democrats spent years sounding the alarm on “dark money” as groups pummeled their senators. Now, the left is the side delivering the early blow. A quartet of new nonprofit groups has already spent millions of dollars hammering four of the most vulnerable Republican senators on the ballot next year, sparking a wave of concern among strategists trying to protect the GOP’s slim three-seat Senate majority in 2020.
Outside groups in Arizona, Colorado, Maine and Iowa have already spent or booked over $1 million in each state — and in some cases much more, according to Advertising Analytics — on advertising criticizing the senators, more than doubling the spending from Republican-aligned groups trying to respond. And in one state, Sen. Cory Gardner (R-Colo.) has faced the onslaught without any backup from Republican allies.