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The ads will run in the states of Republican Sens. Kelly AyotteKelly Ann AyotteExplaining Democratic victories: It’s gun violence, stupid Trump voter fraud panel member fights back against critics Dems plan to make gun control an issue in Nevada MORE (N.H.), Saxby ChamblissClarence (Saxby) Saxby ChamblissLobbying World Former GOP senator: Let Dems engage on healthcare bill OPINION: Left-wing politics will be the demise of the Democratic Party MORE (Ga.), Dan CoatsDaniel (Dan) Ray CoatsNational counterterrorism chief to retire at the end of year Former intel chief Hayden: Think twice on a Trump job offer Counterintelligence needs reboot for 21st century MORE (Ind.), Ted CruzRafael (Ted) Edward CruzDebbie Wasserman Schultz marks 10 years as breast cancer survivor Foreign agent registration is no magical shield against Russian propaganda Let Trump be Trump and he'll sail through 2020 MORE (Texas), Jeff FlakeJeffrey (Jeff) Lane FlakeGOP strategist donates to Alabama Democrat Sasse: RNC help for Roy Moore 'doesn't make any sense' Sasse calls RNC decision to resume support for Moore 'bad' and 'sad' MORE (Ariz.), Chuck GrassleyCharles (Chuck) Ernest GrassleyGrassley blasts Democrats over unwillingness to probe Clinton GOP and Dems bitterly divided by immigration Thanks to the farm lobby, the US is stuck with a broken ethanol policy MORE (Iowa), Dean HellerDean Arthur HellerDems look to use Moore against GOP Senate hearing shows Fed chair nominee acts the part Senate GOP votes to begin debate on tax bill MORE (Nev.), Johnny IsaksonJohn (Johnny) Hardy IsaksonSenate ethics panel wants details on sexual harassment allegations Senate leaders push tax debate into Friday Senate Ethics Committee opens 'preliminary inquiry' into Franken allegations MORE (Ga.) and Rob PortmanRobert (Rob) Jones PortmanMcConnell names Senate GOP tax conferees Overnight Finance: House approves motion to go to tax conference — with drama | GOP leaders to consider Dec. 30 spending bill | Justices skeptical of ban on sports betting | Mulvaney won't fire official who sued him How four GOP senators guided a tax-bill victory behind the scenes MORE (Ohio), and in North Dakota, home of Democratic Sen. Heidi HeitkampMary (Heidi) Kathryn HeitkampThe Hill's 12:30 Report Avalanche of Democratic senators say Franken should resign Senate panel moves forward with bill to roll back Dodd-Frank MORE.

The ads urge gun-control supporters to "remind Senator Heller: You work for Nevada, not the gun lobby."

OFA has not yet indicated which senators it believes are most likely to be swayed on gun control, but the first series of paid ads since the gun-control vote hints at the group's targets.

Ayotte is likely to remain a top target for gun-control groups, as a recent poll indicated she suffered among Democrats and independents in New Hampshire due to her vote, but she's not up for reelection until 2016.

Notably missing from the list are three of the other Democrats who voted no on the measure to expand background checks that failed in the Senate last week: Sens. Max BaucusMax Sieben BaucusBooker tries to find the right lane  Top Lobbyists 2017: Hired Guns GOP tries to keep spotlight on taxes amid Mueller charges MORE (Mont.), 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.) and Mark BegichMark Peter BegichPerez creates advisory team for DNC transition The future of the Arctic 2016’s battle for the Senate: A shifting map MORE (Alaska).

Baucus will be retiring in 2014. Many observers consider his no-vote the result of constituent concerns, rather than political considerations, and don't see him as a likely vote in favor of gun control.

Baucus and Pryor, however, could face backlash from Democratic base voters if they're targeted on gun-control, a potentially crippling blow for the two senators, who face difficult reelection fights in red states next year.

But OFA Executive Director Jon Carson told The Hill earlier this week that the group isn't concerned about the potential political ramifications of attacks on red-state Democrats, and will target all senators who voted against gun control.

“No — we’re concerned about [them] not passing this background check bill,” Jon Carson, OFA’s executive director, told The Hill in an interview.