I have missed calls from this number.  They leave no message.

This is a survey company called SSI they do not leave messages on missed calls but in returning the call this is what I found.

received call on a cell phone number that I generaly do not give out much. they were unable to tell em where they got my number

I answered and agreed to take the political poll, but they said it would be 3-4 minutes and I had to stop the call at 8 minutes because I had to go. I told the lady (who didn't properly pronounce my congressman's name) that I had to go and she said "one minute mam" and kept going, so I hung up. They called right back, but I didn't answer.

This appears to be Survey Sampling International, you can check them out at surveysampling.com    If you do not wish to speak with these people and you have the ability to block numbers, then you will want to block the following:

385-207-703x
385-207-704x
385-207-705x
801-823-202x
801-823-203x

From their website:  SSI (www.surveysampling.com) is the premier global provider of sampling, data collection and data analytic solutions for survey research, reaching respondents in 78 countries via Internet, telephone, mobile/wireless and mixed-access offerings. Additionally, SSI staff operates from 26 offices in 18 countries, to offer CATI, questionnaire design consultation, programming and hosting, online custom reporting and data processing. SSI serves more than 3,000 clients worldwide.