With GOP presidential candidate George W. Bush expected to name his running mate in less than 36 hours, former Defense Secretary Richard Cheney remains a leading prospect to fill the post. Cheney was tapped in April to lead Bush’s vice-presidential selection process, a move that was initially thought to lessen the odds that he would be chosen to join Bush on the Republican ticket. But a number of recent revelations suggest that the former congressman and cabinet secretary may now be atop Bush’s short list, as the Texas governor nears what may be the most important decision of his presidential campaign.