Pryor raised $1.9 million, making his the largest fundraising haul so far of Democrats facing tough reelection prospects next year. It's especially impressive since he hails from a small, poor state where fundraising dollars are hard to come by.

That number was boosted significantly by a fundraiser with Clinton early in the year that brought in $1 million. He now has $3.4 million in the bank.

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Republicans don't yet have a candidate, though national Republicans are hopeful Rep. Tom CottonTom CottonGOP and Dems bitterly divided by immigration Grassley offers DACA fix tied to tough enforcement measures Five things senators should ask Tom Cotton if he’s nominated to lead the CIA MORE (R-Ark.), a freshman and favorite of both Tea Party groups and national security hawks, will jump into the race. Cotton is also a fundraising powerhouse, making Pryor's haul even more important.