Michael Grunwald of the Washington Post has an interesting theory on why President Bush hasn't vetoed anything since he's been in office : "Bush likes to project an image of strength bordering on omnipotence , where every initiative is a presidential initiative, everyone marches to the presidential beat, and everything happens according to the presidential plan -- even when he's clearly changing that plan, as when he co-opted the Democratic proposal to create a Department of Homeland Security or when he incorporated a popular Democratic idea to send $300 to every American into his own tax-cut plan. A veto does not square with this aura of all-powerful, agenda-setting leadership. It's a defensive, reactive measure, used to block someone else's initiative, suggesting a lack of discipline within the Republican ranks ." What that implies is that (for Bush) the veto is more or a signal than a threat: " So when the Bush administration has floated veto threa...