President Bush's aides are reviving his long-shelved plan to let workers divert some Social Security taxes into stocks as a reelection issue, gambling that market drops have not soured voters on the politically risky idea. Republicans on Capitol Hill have refused to touch his 2000 campaign proposal to overhaul the nation's largest domestic program, and some of his allies remain leery of pushing an issue that Democrats have long used to woo senior citizens by charging "privatization." Bush aides said he will make the longtime conservative goal more palatable by discussing changes to Social Security as part of a set...