Conservative commentator George Will doesn't believe Chief Justice John Roberts will vote for gay marriage, but added that the Supreme Court would side with advocates of marriage equality.

House lawyers under the direction of Speaker John Boehner, a Republican from Ohio, last week asked the Supreme Court to review a case challenging the constitutionality of the Defense of Marriage Act (DOMA), the 1996 law which prohibits federal agencies from recognizing the legal marriages of gay and lesbian couples.

A second possible avenue is a case involving California's gay marriage ban, Proposition 8. Supporters of the law have vowed to take the case to the nation's highest court, though they have yet to file a request.

Federal appeals courts have struck down DOMA and Proposition 8, saying they were unconstitutional.

Does Roberts' siding with the court's more liberal members last week in upholding the Affordable Care Act translate into a greater likelihood of support for marriage equality, host George Stephanopoulos asked Will on ABC's This Week.

“There won't be six,” Will said, but added that Justice Anthony Kennedy's “libertarian dimension” may cause him to “be the fifth vote for gay marriage.”

Douglas NeJaime, an associate professor of law at Loyola Law School in Los Angeles, agreed, telling On Top Magazine that he didn't think “we can draw many insights for same-sex marriage from Chief Justice Roberts' healthcare decision.”

“The issues, of course, are completely different, and we don't have much of an indication of Roberts’ thinking on DOMA and state marriage prohibitions,” NeJaime said in an e-mail. “If anything, we know that Justice Kennedy, who joined Justices Scalia, Thomas, and Alito on the healthcare issue, has a different view on sexual orientation equality than those other Justices. He takes to the same-sex marriage question a different set of commitments, and that distinction will continue to be important as the Court weighs in on same-sex marriage.”