Not an expert on the game or stakes, but this seems like a premium hand, so I would pot it last to act at several limpers. I can't see why this is a question. This is one of the rest hands you will get.
Yeah, probably your raising range should be tight in bad position postflop, so others may figure you have a premium hand, always A2 with other good stuff. However, you still need to build the pot.
Assuming suited to the A I'm raising from MP to BTN. UTG I can see why some would want to call; I probably just raise then, too. Half pot to pot is good.
