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The PAC now has $2.4 million cash on hand and no debt. It spent very little of that $1.1 million in January, contributing only $1,000 to Rep. Lynn Westmoreland (R-Ga.) and $2,500 to Rep. Bob GoodlatteBob GoodlatteOvernight Cybersecurity: Equifax security employee left after breach | Lawmakers float bill to reform warrantless surveillance | Intel leaders keeping collusion probe open House bill set to reignite debate on warrantless surveillance Warrantless wiretapping reform legislation circulates on Capitol Hill MORE (R-Va.). 

The spike in donations reflects the prominence of President Obama's efforts to expand gun control measures, which have faced backlash from Republican lawmakers.

But the NRA is also going on offense on gun control, launching a four-state advertising blitz this week against three incumbent Democrats up for reelection in 2014 and one retiring Democratic senator.

Sens. 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 (Ark.), Mary LandrieuMary LandrieuYou want to recall John McCain? Good luck, it will be impossible CNN producer on new O'Keefe video: Voters are 'stupid,' Trump is 'crazy' CNN's Van Jones: O'Keefe Russia 'nothingburger' video 'a hoax' MORE (La.) and Kay HaganKay HaganLinking repatriation to job creation Former Sen. Kay Hagan in ICU after being rushed to hospital GOP senator floats retiring over gridlock MORE (N.C.), as well as retiring Sen. Jay RockefellerJay RockefellerOvernight Tech: Trump nominates Dem to FCC | Facebook pulls suspected baseball gunman's pages | Uber board member resigns after sexist comment Trump nominates former FCC Dem for another term Obama to preserve torture report in presidential papers MORE (W.Va.), are targeted in the ads.