The so-called “green wave” of cash that led to Democrats taking back the House in 2018 is now rapidly cresting for Senate Democrats, helping improve their odds to retake the chamber with less than four months until Election Day.

Even amid a pandemic and economic collapse that many thought could bring a slowdown of donations, Democrats' money machine in key Senate races showed no signs of ebbing in the second quarter of 2020. In the 11 races we currently rate as our most competitive (Toss Up or Lean), Democrats outraised Republicans in 10 of those.

In the five key matchups, we currently rate as Toss Ups — Arizona, Colorado, Maine, Montana and North Carolina — Democratic challengers outraised Republican incumbents in each contest by almost $18.5 million, with about $42.6 million raised by Democratic candidates compared to $24.1 million by GOP incumbents. Democrats have also outpaced Republicans in total contributions this cycle in this quintet, about $108.7 million to $91.6 million.

The increasing cash disparity — especially the fact that the cash on hand advantage GOP incumbents

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