Anti-gambling activists are touting a major political boost from U.S. Sen. Elizabeth Warren as their campaign to repeal the state's casino law heads into the final stretch.

The first-term Democrat said Monday following the Boston Labor Council's Labor Day breakfast that she'll likely vote in favor of repealing the law that opened the door for Las Vegas-style gambling in Massachusetts. On Tuesday, Repeal the Casino Deal hailed the comments as a "bold stand" by one of the state's most prominent politicians.

As a candidate in 2011, Warren opposed the decision to expand the state's gambling law to allow for up to three resort casinos and one slot parlor. Question 3 would repeal that law, effectively ending the state's licensing process before the first casino project can even open.