Democratic Senate contenders were under fire in five states Tuesday as the super PAC affiliated with Senate Majority Leader Mitch McConnell, R-Ky., hit the airwaves with a spate of attack ads.

Senate Leadership Fund announced $5.7 million worth of television, radio, and digital advertising in Indiana, Missouri, and North Dakota, three states Republicans are hoping to flip in the midterm elections to pad their 51-49 majority; and Nevada and Tennessee, where Democrats hope to swipe GOP-held seats on their way to capturing the Senate.