No matter what you think of the guy or what his season stats are one could make a strong argument that Alex Rodriguez deserves to be in the discussion about MVP, at least up to this point of the season. I will start off with the most telling statistic: Yankees during AROD injury were 13-15 and post injury 41-22. Yes AROD's stats are sub-par to be considered the so called "MVP", but the Yankees have the best record in baseball since May 8th because of AROD. His presence in the lineup, whether he is batting .250 or .350 is unparalleled to almost any player in the MLB (except maybe Pujols). He creates opportunities for his teammates because he is feared by pitchers across the league.
Before AROD came back from injury, Mark Teixeira was completely lost and understandably so. With no true threat behind him, Teixeira hit 3 HRs while batting .200 with a .738 OPS. However, once AROD was back, Mark Teixeira became the player the Yankees thought he would be . In AROD's first month back, Teixeira hit 13 HRs while batting .330 clip with a 1.138 OPS.
There is no other player in the AL that has the same impact on their team.