The following are his own words:
"Highly troubling are the preceding verses where Jesus denounces the scribes who “devour widows’ houses.”. . . the juxtaposition of these references to widows raises questions. The questions become more worrisome when we recall how the prophets denounced those who oppressed widows and orphans almost every time they spoke out on social issues. The very next verse on the other side of the story of the widow and her two coins raises even more urgent questions. In response to a disciple’s commenting on the great stones of the temple, Jesus says: “Not one stone will be left here upon another; all will be thrown down.” (Mk. 13: 1) This suggests that the poor widow is giving her last two coins for a bad cause. . .
Is this poor widow a bad example, then? By no means. This poor widow reminds us of the widow who gave Elijah some of the last grains of meal that she had after which she expected to die with her son. (1 Kings 17: 12) . . . Since giving everything is a sign of the Kingdom of God, the poor widow is a sign of the Kingdom while the rich man who went away sad and the rich who contributed lavishly to the temple treasury are not."I encourage you to read his exegesis on the passage (it is fairly short).