The 30-second ad notes that Pomeroy sided with Mr. Bush on a Medicare prescription drug plan and joined Republicans on stricter regulations for internet sex offenders. It also criticizes his Republican opponent, Rick Berg, for being on the opposite side on those issues.
"When George Bush proposed a Medicare prescription plan, Earl Pomeroy voted yes, putting seniors before party," a narrator says in the spot. "Berg would roll back prescription drug coverage."
The congressional race in North Dakota is a toss-up at this point in the election season, CBS News estimates.
Many Democrats have sought to distance themselves from their president and his party to win reelection, though few have embraced Mr. Bush, who was widely unpopular with when he left office.