Foes of same-sex marriage are laboring to pay the tab for an epic legal case now before the U.S. Supreme Court, as the movement suffers from fundraising shortfalls that could sap its strength in future battles. ProtectMarriage.com, the advocacy group defending a California gay marriage ban now under review by the high court, showed a $2 million deficit in its legal fund at the end of 2011 - the third year in a row that expenses exceeded donations, federal tax records show. The 2012 accounts are not yet available. ProtectMarriage.com says it has since covered the 2011 shortfall. However, it is still $700,000 short in fundraising for its Supreme Court costs, according to a ProtectMarriage.com attorney, Andrew Pugno. That message has gone out to donors, with some urgency, as the Supreme Court prepares to hear arguments in March in its first thorough review of same-sex marriage.