Sen. Mark Pryor needs all the help he can get. The Arkansas Democrat is trying to widen the razor thin margin he currently enjoys in the polls over his Republican challenger Tom Cotton in a race that has attracted millions of dollars from national political groups from both sides of the political spectrum. The Senate Majority PAC — a Democratic super PAC run by former aides of Majority Leader Harry Reid, D-Nev., — revealed Wednesday it has fired off another six figure  ad expenditure ($464,000) opposing Cotton, the sitting congressman for the state’s Fourth District.

The filing coincides with President Obama’s trip to the state, where he surveyed storm damage and briefly met with Pryor and others Wednesday, before flying to Los Angeles, Calif. to attend a series of fundraisers for the Democratic National Committee.

A call to Senate Majority PAC for more details on the upcoming advertisement was not immediately returned. A previous ad from Senate Majority attacked  Cotton for supposed fealty to health insurance giants, “before Congress, Tom Cotton got paid handsomely working for insurance companies and corporate interests…now Cotton wants to end Medicare’s guarantee, giving billions in profits to insurance companies while costing seniors $6,000 more a year.” The Washington Post’s Glen Kessler disagreed with that statement, calling it “totally false.”

Real-Time FEC shows that outside groups have spent at least $4.7 million in the race thus far.