"We're very happy with it," Pryor campaign manager Jeff Weaver told The Hill. "We're still full-speed ahead and happy at where the campaign's at right now."

Rep. Tom CottonTom CottonOvernight Finance: GOP criticism of tax bill grows, but few no votes | Highlights from day two of markup | House votes to overturn joint-employer rule | Senate panel approves North Korean banking sanctions GOP senator: CBO moving the goalposts on ObamaCare mandate Cruz: It’s a mistake for House bill to raise taxes MORE (R-Ark.) is seriously considering a run, and is a prodigious fundraiser popular with both the GOP's donor class and its Tea Party base. National Republicans believe Pryor is the most vulnerable senator up for reelection this cycle.

The total makes Pryor the latest Senate Democrat to post a strong fundraising quarter. Though it's a significant dip from his $2 million first-quarter haul, that was buoyed by a $1 million event with former President Clinton, making it a tough performance to repeat.