Clinton headlined a number of fundraisers for Pryor this weekend, helping the endangered incumbent rake in $1 million, according to Arkansas Business News.

Pryor is a top target for conservative groups in 2014, and both the Senate Conservatives Fund and the Club for Growth have already targeted the Democrat with ads tying him to President Obama.

Of the outside spending on the race, Clinton said that "we ought to be able to regain our common sense and not be turned into blithering reactionary people who just get our hot buttons punched."

And in remarks to a crowd at one campaign stop, Clinton worked to frame the race in local, rather than national, terms.

"The reason this is a race of national sign is because it's about whether a senator who cares about his own people more than ideological purity can be financed, elected, lifted by the people he has served in the face of all these crazy currents that are taking America and tearing it to shreds," Clinton said.

President Obama lost Arkansas by more than 20 percentage points in 2012, and Republicans believe they can take the reddening state, but none have yet made their bids for the seat official.

Lt. Gov. Mark Darr has indicated an interest, and Rep. Tom CottonThomas (Tom) Bryant CottonLawmakers introduce bill to block U.S. companies from doing business with Huawei Five things to know about Iran's breaches of the nuclear deal Hillicon Valley: Trump gets pushback after reversing course on Huawei | China installing surveillance apps on visitors' phones | Internet provider Cloudflare suffers outage | Consumer groups look to stop Facebook cryptocurrency MORE (R-Ark.) is considered a strong potential candidate, though he declined to comment on a run when asked by The Hill last week.