ALBANY—It’s rapidly becoming statistically impossible for Assemblyman Jim Tedisco to win a seat in Congress. My figures are inexact—the calculations here are based on both official Board of Elections numbers, and on conversations with election officials and both campaigns—but the math looks pretty conclusive. Here’s what I’ve come up with: On Election Night, Democrat Scott Murphy finished with about a 60-vote lead over Tedisco, with no absentee ballots counted. Recanvassing of mechanical machines put Tedisco ahead by 66 votes. Out of a total of about 7,200 absentee ballots that were received by the Board of Elections, there are only 800 left to count, according to elections officials and lawyers for both campaigns.