Who was the president that supported the terrorist regime of the Shah of Iran? Oh yeah, pretty much every Democratic and Republican president from between 1941 and 1979.
Who was the guy who had our Marines run out of Lebanon with their tails between their legs after one bombing? Oh yeah, Reagan.
Who was the guy who thought trading arms for hostages seemed like a pretty smart idea? Oh yeah, Reagan again.
Who decided that Saddaam Hussein should remain in power during the Gulf War (a decision that seemed smart to me, but was also in many ways appeasing)? Oh yeah, Bush Sr.
Who claimed that Somalia and Kosovo were "wag the dog" Clinton escapades we should get out of immediately? Oh yeah, pretty much every Republican.
It's absolutely ridiculous and ignorant to blame 9/11 on just the Democrats. It's like saying, "Reagan won the Cold War!" when it ignores decades of work by millions of people all over the world, economics, and the policies of a number of US presidents and other world leaders.