Outside groups pump $1.5 million into Indiana Senate race

Published: .
Updated: .

Outside groups are spending another $1.5 million in Indiana's deadlocked Senate race this week.

A collaboration of Democratic-aligned groups announced plans Tuesday to spend $1 million on an ad attacking Republican Richard Mourdock for opposing the Chrysler bankruptcy in 2009.

The anti-tax Club for Growth, meanwhile, said it would spend $500,000 in Indiana.

This week has become the most expensive of any Indiana Senate battle as groups bought a $2.75 million of air time.

Mourdock spent $300,000 Monday on a new ad attacking Democrat Joe Donnelly for being "too liberal," and Senate Democrats spent another $439,000.

A Republican tracking ad buys confirmed Tuesday that the National Republican Senatorial Committee was spending $500,000 this week. The Republican requested anonymity because the NRSC does not openly talk about numbers.

Decision 2012 coverage

(Copyright 2012 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.)