By trying for 20 or 30 years to find one and then finally getting lucky by being bad in the right year when the Bears chose a lesser QB over Daniels.
Frankly, the Saints got really unlucky by being accidentally bad in a year where 5 wins only gets you the #9 pick and there are no QBs worth the #9 pick. In most years 5 wins gets you a top 5 pick and there is usually a QB there or in your range to trade up that is worth a top 5 pick.