Actually, according to the Massachusetts election laws, there are situations wherein certain requirements are met and someone can assist in the voting booth. The question here, however, is if all of the requirements were met for this assistance.
GENERAL LAWS OF MASSACHUSETTS - CHAPTER 54. ELECTIONS.
Chapter 54: Section 69. Persons permitted within guard rail.
Section 69. No persons except the election officers, supervisors, custodians of voting machines when acting in the course of their duties, the city or town clerks, and voters admitted for the purpose of voting, shall, during the progress of an election and until the public declaration of the vote, be permitted within the guard rail, unless authorized by the election officers for the purpose of keeping order and enforcing the law. Children, in the company of a voter, may be admitted within the guardrail unless the election officer in charge deems that the admittance of such child would disrupt the maintenance of order.
Chapter 54: Section 70. Number of voters permitted within guard rail; voters in line at closing time.
Section 70. No more than four voters, besides election officers and supervisors, custodians of voting machines when acting in the course of their duties, and the city or town clerk, in excess of the number of marking compartments provided, shall be allowed at one time within the guard rail. Where voting machines are used, the number of voters allowed within the guard rail shall not be more than twice the number of voting machines provided. After the time fixed for closing the polls, no voters shall be admitted within the guard rail, except the election officers and supervisors, and except voters who are then in the polling place or in line at the door thereof. The presiding officer of the polling place shall provide or cause to be provided to each voter so outside the guard rail a card or slip bearing such voter's name, and the voter shall as soon as practicable present the same to one of the ballot clerks and shall then be permitted to vote if otherwise qualified. When the polls are closed, the presiding officer shall cause a police officer or other qualified person to be stationed at the end of the line of persons waiting to vote to see that no other persons vote than those who were in the polling place or in line at the door at the time fixed for closing the polls. After the last voter in line at the door has entered within the guard rail, the voters shall be allowed five minutes in which to cast their votes.
Chapter 54: Section 75. Report of violations; prosecutions.
Section 75. Every election officer shall forthwith report every violation of any provision of sections sixty-five to eighty-five and one hundred and four to one hundred and thirty-seven, both inclusive, to the police officer or constable in attendance at the polling place, and such police officer or constable shall cause the offender to be prosecuted.
Section 79. A voter who states to the presiding officer that from blindness or other physical disability or inability to read or to read in the English language he is unable to prepare his ballot or register his vote upon a voting machine shall be assisted in such marking or registering by any person whom he may designate.