It's not just Presidential contenders that are getting the benefits of 527's. It's also hitting the state's senate races.
Republican and Democratic-supported groups have spent about $350 thousand in 6 battleground contests.
Forward Colorado, a Democratic group, has spent about $250 thousand while Republican-backed Senate Majority Fund LLC has used about $100 thousand.
The 527's, named after their IRS tax designation, are controversial because they are not required to report political contributions.