I received calls from this number for the last few days.  Finally decided to answer. It is Tom Tancredo running for governor of CO.  I asked why the hell he was calling me in Louisiana.  I have no interest nor can vote in CO.  

Silence when you pick up the phone always indicates a robocall is in progress.  Sometimes they never answer, rolling to the first call to pick up and dropping the rest.  Other robocall machines listen for a live person.  After a few encouraging "Hello telemarketer . . . " and "Come on robo-call, you can connect . . . ," from me it did.  The telemarketer said he was from the Colorado Police Association or something like that.

Police, Sheriff, and other law enforcement entities used to make calls themselves to raise money for good causes.  People gave because they figured doing so was "insurance" against "imperial entanglements," or that the failure to give would surely result in police harassment, extra speeding tickets, etc.  None of which is true, of course.

The police haven't been making their own calls in decades.  Realizing the intimidation factor that comes with announcing to some hapless caller (on Mothers' Day, no less) "this is the police!," paid solicitors have been running this racket since the 1970s, remitting some to the police (assuming its not a complete scam), but keeping a huge percentage for themselves.  A curt, "Yeah, [***], goodbye" from me is all this jackwad received.

A few linked stories to validate my comment above from the Denver Post and Ripoff Report about calls purportedly made on behalf of the Colorado Police Protective Association:

http://www.denverpost.com/ci_20041247

http://extras.denverpost.com/charity/charity0211.htm

http://www.ripoffreport.com/reports/specific_search/Colorado+Police+Protective+Association

Not sure. didnt pick up. got it in Colorado springs

Had a missed call and voicemail from this number. The call was made around 6:30pm, and the location is stated as Aurora, Colorado.
The voicemail is a few seconds long but only static silence.
Very strange.