Reraise all in ATo 10$ SNG

[Vinetou]

PokerStars No-Limit Hold'em Tourney, Big Blind is t100 (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

MP (t2370)
CO (t3205)
Button (t1945)
Hero (t1085)
BB (t2675)
UTG (t2220)

Preflop: Hero is SB with A[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/club.gif[/img].
<font color="#666666">3 folds</font>, <font color="#CC3333">Button raises to t400</font>, <font color="#CC3333">Hero raises to t1085</font>, <font color="#666666">1 fold</font>, Button calls t685.

The guy seemed to be loose aggressive and began to steal my blinds so I decided to make a stand with this hand. Is this an easy push or a terrible mistake?