Pros
Pay is great for a job with no drug tests ($15-22/hr for most positions), a generous background check and nothing more than a high school-level quiz required for placement. If you test high and earn a supervisory position, you will get paid for 40-50 hours a week and work maybe 20 hours a week if you're involved and 10 if you're incredibly lazy. The oversight is often very low and people can really do very little work and earn a nice chunk of money.
Cons
Dangerous to go door to door in bad neighborhoods if you're an enumerator. People in these neighborhoods are often (sometimes rightfully) very suspicious of police, authority or government officials and can react poorly. You are guaranteed nothing and they can lay you off before you ever work your first day. You sign two month agreements but you are not promised any work for those two months, though it's possible to work 40 hours a week for years if you land in the right place and they need you.