Independent Angus KingAngus Stanley KingTrump rips Dems a day ahead of key White House meeting Trump pushing Maine gov to run for Senate: report Schumer: Franken should resign 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 DonnellyTrump rips Dems a day ahead of key White House meeting The Hill's 12:30 Report Avalanche of Democratic senators say Franken should resign MORE in Indiana, Heidi HeitkampMary (Heidi) Kathryn HeitkampThe Hill's 12:30 Report Avalanche of Democratic senators say Franken should resign Senate panel moves forward with bill to roll back Dodd-Frank MORE in North Dakota and Sen. Jon TesterJonathan (Jon) TesterGOP and Dems bitterly divided by immigration Senate panel moves forward with bill to roll back Dodd-Frank GOP defeats Schumer bid to delay tax vote 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 Michael KaineDemocrats turn on Al Franken Avalanche of Democratic senators say Franken should resign Senate panel moves forward with bill to roll back Dodd-Frank 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 BrownThe Hill's 12:30 Report Avalanche of Democratic senators say Franken should resign Overnight Regulation: Feds push to clarify regs on bump stocks | Interior wants Trump to shrink two more monuments | Navajo Nation sues over monument rollback | FCC won't delay net neutrality vote | Senate panel approves bill easing Dodd-Frank rules 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.