Updated at 12:24 p.m. ET, 1/2/2014
(CNN) - A conservative group is kicking off the midterm election year with a multimillion-dollar ad campaign that targets three Democratic Senators facing tough re-election battles in November.
Americans for Prosperity, which spent $16 million on television ads in the fall, will unleash another round of commercials that hammer the trio of lawmakers for supporting Obamacare.
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AFP said the commercials will run in major media markets for the next three weeks, and a spokesman said the ads will cost more than $2.5 million.
The 30-second spots focus on what's been dubbed by PolitiFact as the "Lie of the Year": President Barack Obama's broken pledge that people who liked their health insurance plans could keep them under the Affordable Care Act.
Republicans, and some Democrats, criticized the Obama administration after millions began getting policy cancellation notices last fall. Landrieu and Hagan were among those who wanted to find a legislative fix for the problem.
The ads go after the Senators for repeating the President's promise as they tried to sell Obamacare to the public before and after the law passed in 2010 with only Democratic support.
"Tell Senator Shaheen, it's time to be honest," a narrator says in one clip. "Obamacare doesn't work. New Hampshire families deserve better."
Landrieu's campaign said the ad against her takes her comments out of context and "grossly" misleads.
"The fact is Sen. Landrieu has always supported measures to fix and improve the Affordable Care Act," campaign manager Adam Sullivan said in a statement. "She introduced legislation to keep the president's promise, publically pressured the administration until a fix was made and is continuing her work on behalf of Louisianians to fix and improve the law."
The ad buy follows a $600,000 ad campaign in late December that targeted House Democrats over the same issue.
The Obama administration plans to combat negative ads with positive ones that feature stories about those who are benefiting from the new health care law.
Its allies will also join the effort. Organizing for Action, the advocacy group that originated from the President's reelection campaign, released a new web video Wednesday touting some success stories.
- CNN's Dan Merica and Martina Stewart contributed to this report.