6,574 absentee votes were cast in PA18 in the '16 general. Turnout thus far (eday vote only) is 62.4% of '16 vote totals. So the reports of about 4,000 uncounted absentee votes there are plausible. I'd expect Lamb to gain a margin of about 1,000 votes from those absentees.

— Tom Bonier (@tbonier) March 14, 2018