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clipped from money.cnn.com NEW YORK (CNNMoney.com) -- More bad news on the housing bust front: Nearly 25% of all mortgage borrowers were underwater, meaning they more on their loans than their homes are worth. First American CoreLogic, the research firm that monitors housing equity, reported Tuesday that 11.3 million homeowners -- or 24% of all homes with mortgages -- were underwater as of the end of 2009. That's up from 23% and 10.7 million borrowers three month earlier. Traditionally, being underwater was one of two main factors in determining a borrower's likelihood of foreclosure. The other is having sufficient income to pay bills. But, there's an increasingly important exception: strategic default. As equity gets more and more negative, some homeowners are choosing to quit paying and give the keys to the bank.