The National Rifle Association will weigh in on three of this year 's key Senate races with a multimillion dollar ad buy beginning Wednesday . The NRA effort is aimed at boosting Republican Senate challengers in Arkansas , Colorado and North Carolina -- the outcomes of which could likely determine which party controls the chamber . The group 's campaign is expected to top $ 4 million in these states , spokesman Andrew Arulanandam confirmed to CNN . It will spend $ 1.4 million to boost North Carolina House Speaker Thom Tillis , who is running against incumbent Democrat Sen. Kay Hagan . `` Our Second Amendment rights are under attack by the Obama Administration , and we need leaders like Thom Tillis in the Senate to fight back , '' states the ad . The group will also spend about $ 1.4 million to run similar ads for Rep. Tom Cotton , R-Arkansas , who is challenging incumbent Democrat Sen. Mark Pryor and about $ 1 million in Colorado on behalf of Rep. Cory Gardner , running against Sen. Mark Udall . The group also last month launched several multimillion dollar ad campaigns -- one pushing Republican Ed Gillespie , who is up against Democrat Sen. Mark Warner . The other one talks about issues beyond gun rights , trying to reach those who believe the country is on the wrong track as it highlights such issues as the IRS targeting scandal and NSA surveillance . The group also has run ads attacking former New York Mayor Michael Bloomberg , who has vowed to spend $ 50 million of his own money this year pushing for more gun control as he and his group Everytown Gun Safety tries to counter the political influence of the NRA .
Group wants to help GOP candidates in Arkansas , Colorado and South Carolina . They will also try to reach those who think country is on wrong track . Group has run ads attacking ex - N.Y. Mayor Bloomberg and his Bloomberg Public Safety group .