According to an LA Times poll:
Nearly eight in 10 Americans now accept the Bush administration’s contention — disputed by some experts — that Hussein has “close ties” to Al Qaeda (even 70% of Democrats agree). And 60% of Americans say they believe Hussein bears at least some responsibility for the Sept. 11, 2001, terrorist attacks — a charge even the administration hasn’t levied against him.
(Update) The same poll also tells us:
Exactly half said the United States should take military action against Iran if it continues to move toward nuclear-weapon development; 36% disagreed.
And:
Americans are divided almost in half when asked whether the United States should take military action against Syria, which Defense Secretary Donald H. Rumsfeld has accused of providing Iraq with military supplies. Syria has denied the accusation. But 42% said the United States should take action if Syria, in fact, provides aid to Iraq, while 46% said no.