Some ads, like those targeting Democrat Scott Peters (Calif.) and Rep. John Tierney (D-Mass.), highlight scandals specific to the candidate and the race. Peters is accused of voting to underfund pensions and hide it with fraudulent bond disclosures in San Diego during his time on the city council, and Tierney is linked to his family's gambling ring -- both issues that have remained central in their opponents' attacks.

Others, however, are essentially cookie-cutter attacks on the Democratic candidate's connection to House Minority Leader Nancy Pelosi (D-Calif.) or President Obama, and Democratic policies such as the stimulus or the healthcare reform law.

The ad blitz is part of an aggressive strategy from Republicans to defend their control of the House — by most accounts, a likely outcome of the November elections. Democrats would need a net win of 25 seats to regain the lower chamber, and a number of vulnerable Democratic incumbents have made such an outcome unlikely for the party.

But Republicans won't take a single seat for granted in the six weeks leading up to Election Day, as this new spate of advertisements indicates.

The ads, and the Democrats they target, can be seen below:

AZ-01: Ann Kirkpatrick

AZ-09: Kyrsten Sinema

CA-07: Ami Bera

CA-09: Rep. Jerry McNerney

CA-10: Jose Hernandez

CA-52: Scott Peters

CO-06: Joe Miklosi

GA-12: Rep. John Barrow

IA-01: Rep. Bruce Braley

IA-03: Rep. Leonard Boswell

IL-13: David Gill

KY-06: Rep. Ben Chandler

MA-06: Rep. John Tierney

MI-01: Gary McDowell

NC-08: Rep. Larry Kissell

NH-02: Ann Kuster

NY-19: Julian Schreibman

NY-24: Dan Maffei

NY-27: Rep. Kathy Hochul

OH-06: Charlie Wilson

PA-12: Rep. Mark Critz

TX-23: Pete Gallego

UT-04: Rep. Jim Matheson

WI-07: Pat Kreitlow

WI-08: Jamie Wall

WV-03: Rep. Nick Rahall