PROVIDENCE, R.I. -- The local chapter of the National Organization for Marriage is launching a $100,000 TV advertising campaign aimed at defeating the legalization of same-sex marriage in Rhode Island.

The first TV ad scheduled for airing on Tuesday will challenge "Governor Lincoln Chaffee's claim to have a mandate to redefine marriage,'' according to a news release issued by the group that misspelled new Governor Lincoln D. Chafee's name.

"Lincoln Chaffee got just 36% of the vote in the recent election, and fewer popular votes than the Cool Moose Party's candidate for Lieutenant Governor," Christopher Plante, executive director of NOM-RI, said in the release. "Our message is that getting 36% of the vote is no mandate to redefine the institution of marriage for all of Rhode Island society."

The ad has also been posted on YouTube.

Plante, in his news release, said the independent Chafee -- who won office by beating Republican, Democrat and Moderate Party candidates -- is "an accidental governor for Rhode Island, elected in the most unusual of circumstances ... Yet he expects legislators to follow him off the cliff in pursuit of same-sex marriage.''

"If legislators in Rhode Island wish to redefine marriage, they should put this issue on the ballot where the people themselves can decide if they wish to abandon one of the most fundamental institutions of society,'' Plante said.

The NOM-RI ad began airing on the same day that Marriage Equality-RI plans an event at the State House, to deliver "thousands of postcards'' supporting same-sex marriage to lawmakers as they arrive for 4 p.m. House and Senate sessions.

(The original version of this story was published at 8:15 p.m. Monday.)