Originally Posted by diamond_06_06
Is this the distinction made between being able to act last and not being able?
Yes. A straddle is "live" and has the option to raise again preflop (even if there has been no raise, only calls of the straddle). If the poker room does not allow the last action preflop to the person to the left of the big blind who is posting chips in the amount of double the big blind, then I would consider that simply a raise in the dark.
Note that the reason
someone could make a blind raise in this position is that the action is on them first; i.e., you can't raise blind (or straddle) from a random spot on the table.
It should also be pointed out that a straddle is not allowed in tournaments.