"Does Mark Begich stand with President Obama and believe more of Alaskans’ hard-earned tax dollars should be given to the IRS to implement ObamaCare?" the NRSC asks in its release targeting Alaska's Democratic senator.
"Like President Obama, does Mark Begich trust that the IRS will properly utilize the additional taxpayer dollars, rather than spend it on lavish staff retreats?"
Besides Begich, the NRSC targets include: Mark Pryor (D-Ark.), Mary Landrieu (D-La.) and Kay Hagan (D-N.C.) Reps. Bruce Braley (D-Iowa) and Gary Peters (D-Mich.) and businesswoman Michelle Nunn (D), who is expected to run in Georgia.
All but Nunn were in Congress when ObamaCare passed and voted for the law.
The Democratic Senatorial Campaign Committee fired back.
"Republican candidates will be forced to explain why they side with big insurance companies who are fleecing patients, discriminating against people with preexisting conditions, and cutting coverage for families when a loved one gets sick," DSCC spokesman Matt Canter said.
"Last cycle national Republicans spent an estimated $200 million on ads attacking Democrats over Obamacare and every single Democratic Senator won reelection. This is a failed strategy, but they are welcome to continue their losing ways."
—This post was updated at 11:05 a.m.