Call it Americans for Republican Job Security. The group, actually called Americans for Job Security, has spent nearly $1 million in the past two weeks on ads targeting Democratic challengers to four embattled Senate Republicans.

Most of the ads against Democrats Al Franken of Minnesota, Jeanne Shaheen of New Hampshire, Kay Hagan of North Carolina and Bruce Lunsford of Kentucky blame the candidates for wanting or instituting higher taxes. The one against Franken says, "This from a guy who was caught not paying his own taxes." Listen to them all here.

Americans for Job Security is famous for playing in electoral politics without disclosing donors, so we get excited whenever we find a clue about its funding. The group received $25,000 in August from the Neighborhood Preservation PAC, which represents landlords in New York City.