There has been much discussion about whether votes in this next election will be counted securely.
Every state has rules about what poll observers can do at the polls and how votes can be challenged. Here are the rules for your state:
Minnesota At election to fill partisan offices, the chair of an authorized committee of each major political party may appoint by written certificate voters from that political party to act as challengers of voters at the polling place for each precinct. Only one challenger from each major political party for each precinct shall be allowed to remain in the polling place at one time. A challenger must be a resident of the state. (Minn. Stat. § 204C.07).
An election judge and an authorized challenger or other voter may challenge an individual based upon personal knowledge that the individual is not an eligible voter. (Minn. Stat. § 204C.12)
Representatives of the secretary of state's office, the county auditor's office, and the municipal or school district clerk's office may be present at the polling place to observe election procedures. Except for these representatives, election judges, sergeants-at-arms, and challengers, an individual may remain inside the polling place during voting hours only while voting or registering to vote, providing proof of residence for an individual who is registering to vote, or assisting a disabled voter or a voter who is unable to read English. During voting hours no one except individuals receiving, marking, or depositing ballots shall approach within six feet of a voting booth, ballot counter, or electronic voting equipment, unless lawfully authorized to do so by an election judge or the individual is an election judge monitoring the operation of the ballot counter or electronic voting equipment. Teachers and elementary or secondary school students participating in an educational activity may be present at the polling place during voting hours. (Minn. Stat. § 204C.06 for information on other individuals allowed in the polling place.