Twelve states allowed absentee voting by soldiers. Lincoln got 119,754 to McClellan's 34,291. This was despite Democratic Party measures to prevent soldiers from voting. (Amazing how things stay the same, isn't it?)
Lincoln won the popular vote by over 500k, so obviously the soldier vote didn't change that result, though it might have made the difference in some states.
In particular, would you like to present something vaguely resembling evidence that Union Army officers counted the absentee votes, or at any rate counted them all? Here is some evidence that sealed ballots were mailed back to the home state and counted by officials there.
http://www.co.washington.ny.us/PDF/His/ABSENTEE%20BALLOTS%20FOR%20SOLDIERS1864.pdf
What do you got, besides a whine?
I was only quoting the professor who presented a lecture on the election of 1864 during a History course I took at George Mason University back in 1998. If you would like to discuss this subject with him, I can provide his name.
And, as for “What do you gots beside a whine,” I don’t exchange insults with those who hide behind anonymity on the internet.