I'm with Muse here. You have to assume two overcards at best even though it is a big stack playing aggresively.
In tournaments you often have to fold a big hand to win as well as luck out on a few occasions. 77 is far from being a big hand.
Get into the last 20 and it soon becomes 13,14 left and you can quickly move up the prize money. Short stacks here will gamble with anything.
Dan Harrington says it is all about survival and as for the quote about to live you have to be prepared to die - why die for your country, make some other fool die for his.
I played a tourney the other day where thirty people got paid and someone on my table was a cert for 31st place. He survived to the money and continued on to finish in 9th spot.