Rhode Island’s House of Representatives will gather at 4 p.m. for a historic vote to legalize same-sex marriage. It will almost certainly mark the first time either chamber of the General Assembly backs the idea. (WPRI will stream the debate live online.) While there’s no doubt the issue remains controversial, polling suggests House lawmakers will be acting in line with public opinion if it approves gay marriage today. Last September, a WPRI 12 poll showed same-sex marriage enjoys significant support among Rhode Islanders, with 56% of voters in favor of legalization, 36% opposed and 14% unsure. Support for same-sex marriage is fairly broad among different types of voters, with one exception: Republicans. Rhode Island GOP voters are the only group that has a majority against legalization, with 59% opposed (and 40% strongly opposed). Voters ages 60 and older are closely split, with 49% of seniors in favor and 43% opposed.