Lady Gaga and Brad Pitt have weighed in on one side, evangelist icon Billy Graham on the other as the four-state showdown over same-sex marriage reaches its Election Day conclusion.

Same-sex marriage has been rejected in all 32 states that have held popular votes on the issue. Gay-rights advocates believe they have a chance to break that streak as Maine, Maryland and Washington state vote Tuesday on whether to legalize same-sex marriage. Minnesota votes on whether to place a ban on gay marriage in its constitution.

There are 176 measures on the ballots in 38 states. Washington, Oregon and Colorado could become the first to legalize recreational use of marijuana. Massachusetts is considering whether to allow physician-assisted suicide, and Californians have a chance to repeal the death penalty.