(CNN) – The conservative group Crossroads GPS said Tuesday it was spending $1.2 million to air television ads in five states with competitive races for the U.S. Senate.
Nate Hodson, a spokesman for the group, said the ads would air in Montana, Missouri, Nevada, North Dakota and Virginia.
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Senate races in those states are considered up for grabs. In Montana, incumbent Democratic Sen. Jon Tester faces re-election, and the slate of Republicans vying for the GOP Senate nomination includes the state's sole congressman, Republican Rep. Denny Rehberg.
Missouri Sen. Claire McCaskill faces a tough re-election in her state, where Republicans vying to oppose her include Rep. Todd Akin, who represents suburbs of St. Louis.
In Nevada, Republican Sen. Dean Heller is running for a full term after being appointed to the seat following the resignation of former Sen. John Ensign. His Democratic rival, Rep. Shelley Berkley, represents the state's first Congressional district.
North Dakota Sen. Kent Conrad, a Democrat, will retire at the end of his term, opening up a race between the Democratic Senate nominee Heidi Heitkamp, a former state attorney general, and Rep. Rick Berg, the state's Republican congressman.
Virginia's Senate race will pit former Gov. Tim Kaine, who also served as chairman on the Democratic National Committee, against a Republican selected in a primary in June. Former Sen. George Allen, who lost his re-election in 2006, is considered a favorite for the Republican spot.
Crossroads GPS, along with its affiliated super PAC American Crossroads, has brought in just under $100 million since the start of 2011, an official with the group said last week. In the past three months the groups' combined fundraising totaled $49 million.
Earlier this month the group went up with both TV commercials and radio ads that were critical of President Barack Obama.
- CNN Political Editor Paul Steinhauser contributed to this report.