Sen. Mark PryorMark PryorMedicaid rollback looms for GOP senators in 2020 Cotton pitches anti-Democrat message to SC delegation Ex-Sen. Kay Hagan joins lobby firm MORE (D-Ark.) raised $1.22 million in the last three months, he announced Tuesday, less than the $1.35 million Rep. Tom CottonTom CottonCruz offers bill to weaken labor board's power Overnight Finance: GOP offers measure to repeal arbitration rule | Feds fine Exxon M for Russian sanctions violations | Senate panel sticks with 2017 funding levels for budget | Trump tax nominee advances | Trump unveils first reg agenda Iran deal faces uncertain future under Trump MORE (R-Ark.) brought in during the same period.

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This is the third consecutive quarter that Cotton has outraised Pryor. But Pryor still has a larger warchest for the top-tier battle, with $4.4 million in the bank to Cotton's $2.7 million.

The two-term senator has led in the last four polls of the race, a shift from earlier polling showing a tie or Cotton with a narrow lead. Both campaigns have been on the air, as have outside groups, in what will likely be a hard-fought race through election day.

This post was updated at 5:25 p.m.