New Jersey

New Jersey has defined a same-sex alternative to marriage as some sort of civil union and it seems to not be working out well.

Texas

Texas passed a constitutional amendment defining marriage in 2005. Here's what Gov. Perry said about it at the time.

"Texans have made a decision about marriage and if there is some other state that has a more lenient view than Texas then maybe that's a better place for them to live," Perry said.

Arkansas

There's a petition underway to attempt to ban unmarried couples from adopting or from acting as foster parents.

As you might guess, Arkansas does not allow gay marriage, although some towns, such as Eureka Springs has a domestic-partnership registry.

Alaska

In 1998 Alaska passed a state constitutional amendment outlawing same-sex marriages.

Alabama

In 2006 Alabama passed a constitutional amendment banning Alabama courts from recognizing gay marriages. Here's the text of the amendment (Amendment 774)

Sanctity of Marriage Amendment.
(a) This amendment shall be known and may be cited as the Sanctity of Marriage Amendment.

(b) Marriage is inherently a unique relationship between a man and a woman. As a matter of public policy, this state has a special interest in encouraging, supporting, and protecting this unique relationship in order to promote, among other goals, the stability and welfare of society and its children. A marriage contracted between individuals of the same sex is invalid in this state.

(c) Marriage is a sacred covenant, solemnized between a man and a woman, which, when the legal capacity and consent of both parties is present, establishes their relationship as husband and wife, and which is recognized by the state as a civil contract.

(d) No marriage license shall be issued in the State of Alabama to parties of the same sex.

(e) The State of Alabama shall not recognize as valid any marriage of parties of the same sex that occurred or was alleged to have occurred as a result of the law of any jurisdiction regardless of whether a marriage license was issued.

(f) The State of Alabama shall not recognize as valid any common law marriage of parties of the same sex.

(g) A union replicating marriage of or between persons of the same sex in the State of Alabama or in any other jurisdiction shall be considered and treated in all respects as having no legal force or effect in this state and shall not be recognized by this state as a marriage or other union replicating marriage.

Vermont

In 2000 Vermont legalized Civil Unions for gay couples. Now they're considering legislation to allow gay marriage and it seems that the majority of Vermont might go along with it.

...the poll asked voters to choose between three options for recognition of same-sex unions: full marriage, civil unions or no recognition. Forty percent said they supported marriage, 37 percent civil unions and 21 percent neither.
...
Last summer, the Legislature appointed an 11-member Vermont Commission on Family Recognition and Protection to explore the idea of gay marriage and hear how Vermonters feel about it. The panel, which opponents say is stacked with gay marriage supporters and have boycotted, has held seven hearings and has three more scheduled. The hearings have generated plenty of input, but no name-calling or personal attacks.
...

Civil or religious

Is marriage a civil union or religious union? Can it be both?

California

California Supreme Court is hearing arguements on a gay marriage case on March 4th.

Florida

Florida is putting an amendment on the ballot to limit marriage rights.