<p>WASHINGTON (AP) -- It is a stock market whodunit that has withstood a decade of scrutiny. Who bought George W. Bush's problem-plagued oil company stock just before its value dropped?</p>
<p>The 1990 transaction involving shares of Harken Energy Corp. allowed the future president to pay off a bank loan for his now-famous stake in the Texas Rangers baseball team. The identity of the buyer of the stock has escaped public disclosure.</p>