From our Kampaign Kibitzers desk

Independent expenditure groups are the neutron bombs of the 2014 midterm elections, which could see close to $3 billion in ad spending.

An early explosion is coming from the U.S. Chamber of Commerce, as this Politico piece notes.

A Chamber ad deluge

The U.S. Chamber of Commerce is poised to unveil an onslaught of general-election advertising this week, launching TV spots in nearly a dozen of the most competitive House districts in the 2014 midterm elections . . .

The Chamber declined to share the cost of the TV campaign but called it a multimillion dollar effort, and it appears to represent the powerful business lobby’s most intensive effort so far to leave a mark on the congressional landscape.

Officials with the Chamber said the campaign will include 11 districts from California to Massachusetts . . .

That last would be the Bay State’s Sixth Congressional District, where GOP hopeful Richard Tisei is challenging incumbent John Tierney (D-Wanna Bet?) for a second time.

The Chamber spot:

So far, this is a replay of their previous race: Tisei wants to paint himself as a moderate, Tierney will try to depict him as a Tea Party radical.

Let the wild – albeit largely deceptive – rumpus begin!