I think you're confusing two different issues here.
So a bunch of Al-Queda thugs claim that it is "reasonable" to vote democratic, and viola! Republicans have a reason to point fingers and claim that a vote for the Democratic Party is to support Al-Queda.
Nobody here on this message board claims that Al-Queada ISN'T a threat.
I think I speak for many when I say that it is patently ridiculous to imply that Democrats will embrace a "pro-terrorist" policy--which is what the premise of the initial post was.