FILE - In this Oct. 15, 2010 file photo, Colorado Senate candidates, Sen. Michael Bennet, D-Colo., left, and his Republican opponent Ken Buck, discuss issues in Denver. Interest groups have spent at ... more 
FILE - In this Oct. 15, 2010 file photo, Colorado Senate candidates, Sen. Michael Bennet, D-Colo., left, and his Republican opponent Ken Buck, discuss issues in Denver. Interest groups have spent at least $150 million since just Labor Day to influence voters in close congressional races nationwide, and U.S. House and Senate candidates aren't the only ones targeted in these TV and radio ads. Outside money is pouring at similar rates into state elections for governors and down the ticket to city councils and even local sewage boards. less 
1 / 1
Associated Press | Photo By Ed Andrieski, File
Thu, Oct 28, 2010 7:43 PM EDT