Independent Angus KingAngus Stanley KingSen. King: Releasing memo would be ’reckless,’ ‘could expose sources’ The Hill's 12:30 Report Azar sworn in as HHS chief MORE, running for Senate in Maine, faces a common attack in the new Crossroads ad, which calls him "King Angus" — a title the U.S. Chamber of Commerce has used in its attacks as well. The ad says that "King Angus" "seems to have let down his subjects, the people of Maine" by supporting cuts to school funding and by turning the state's budget surplus into a deficit during his time as governor.

Both the National Republican Senatorial Committee and the Democratic Senatorial Campaign Committee have invested in the Maine race in recent weeks, as Republicans believe they see an opening for their candidate, Charlie Summers, to eke out a win.

Though King retains a lead in most recent polls, Summers was able to close that lead down to single digits in a mid-September poll, and Republican attacks seem to be doing enough damage to spark the Democrats into joining the fight. Though King is independent, he's expected to caucus with Democrats — likely the reason why the DSCC hasn't endorsed the Democratic nominee in Maine, Cynthia Dill, who is unlikely to pull out a win in November.

The spots airing against Rep. Joe DonnellyJoseph (Joe) Simon DonnellyHouse passes bill to ease menu labeling rules under ObamaCare Democrat Manchin: Pence attacks prove ‘they don't want bipartisanship’ in Trump admin Pence optimistic GOP can expand majorities in House, Senate MORE in Indiana, Heidi HeitkampMary (Heidi) Kathryn HeitkampHouse passes bill to ease menu labeling rules under ObamaCare In 2018, Trump must be the small-business champion he claimed to be GOP goes on offense with 20-week abortion vote MORE in North Dakota and Sen. Jon TesterJonathan (Jon) TesterDemocrat Manchin: Pence attacks prove ‘they don't want bipartisanship’ in Trump admin Tester invited the Border Patrol Union’s president to the State of the Union. What does that say to Dreamers?   These Democrats will have a hard time keeping their seats in 2018 MORE in Montana all tie the Democratic candidates to Obama's policies, charging that their support of the policies is equivalent to support for for tax hikes and more spending.

The ad against Donnelly features a photo of him leaving Air Force One with the president, while the North Dakota ad calls Heitkamp a "rubber stamp" for Obama because of her support for the government bailout of the financial system. And the ad running against Tester gets specific, charging that Obama's budget includes "massive defense cuts" that would cut jobs from Malmstrom Air Force Base in Montana and that Tester voted to cut funds from farm programs, "hurting Montana farmers and ranchers."

Crossroads's ad running against Democrat Tim KaineTimothy (Tim) Michael KaineKaine hits Trump over shutdown threat: If you don't want to work, take some extra 'executive time' Dem senators tell Trump he doesn’t have ‘legal authority’ to launch preemptive strike on North Korea McConnell must go nuclear: Abolish the legislative filibuster MORE in Virgina calls him "tax-loving," riffing off the state's motto that "Virginia is for Lovers." It charges that Kaine would raise taxes on "those who can least afford it" and notes his support for Obama's healthcare reform law, which the ad says will raise taxes on the middle class.

And Rep. Shelly Berkley in Nevada is targeted for potential ethics violations, for which she's currently under investigation by the House Ethics Committee. The ad running against her features clips from news reports highlighting aspects of the investigations, and notes that she's been named one of Washington's most corrupt lawmakers by a nonpartisan government watchdog group.

Crossroads GPS is launching another ad against Sen. Sherrod BrownSherrod Campbell BrownTrump accuses Dems of 'treasonous' behavior Former Ohio football star faces conservative rival in GOP primary fight Dems press Trump for 'Buy American' proposals in infrastructure plan MORE in Ohio, which will be released later this week.

Democratic Senatorial Campaign Committee spokesman Shripal Shah dismissed the ads as an effort to "prop up" candidates that would be "loyal rubber stamps for Rove's special interest agenda."

"Rove knows that these Tea Party Republicans will do as he says and put private insurance companies, Big Oil, and millionaires ahead of seniors, small businesses and the middle-class so he’s spending unprecedented amounts of cash supporting their campaigns.  Rove’s dangerous, anti-middle class agenda is wrong for our country and these desperate attack ads are solely designed to distract voters from the consequences of these policies," he said in an email.

--This post was published at 3:54 p.m. and updated at 5:25 p.m.