More than a year after the Iowa Supreme Court legalized gay marriage in the state, a poll finds a majority of Iowans support the decision.

The poll released late Thursday by local CBS affiliate KCCI in Des Moines, found that 53 percent of respondents say they favor marriage rights for gay and lesbian couples, while 41% are opposed.

The high court released its opinion in April of 2009.

During the intervening 14 months social conservatives have mounted a highly divisive effort to overturn the ruling by defining marriage as a heterosexual union in the Iowa Constitution.

That effort has been blocked by Democrats in the Legislature, which must approve the constitutional amendment before sending it to voters.

The Iowa Family Policy Center, the state's most vociferous opponent of gay marriage, and a group called Purpose Ministries have collected signatures from over 800 Iowa clergy, putting candidates for elected office on notice: support banning gay marriage or forgo their support.

At a press conference Wednesday in Des Moines, Iowa Family Policy Center president Chuck Hurley said all statewide candidates to elected office in Iowa will be presented with the petitions.

Another sign that Iowa voters are not that interested in rolling back gay marriage can be found in recent polling showing moderate Republican Terry Branstad with a 15-point lead over businessman Bob Vander Plaats for the Republican gubernatorial nomination. Branstad is the only GOP gubernatorial candidate that supports limited gay rights, while Vander Plaats has pledged, if elected, to halt gay weddings in the state with an executive order until the issue is decided by voters.

Groups opposed to gay marriage, however, insist voters will vote in favor of anti-gay marriage candidates.

“When folks go to the polls next week and then in November, they will, in fact, support candidates who understand their constitution and who will defend marriage,” Bryan English of the Iowa Family Policy Center, told the network.