Congressional Quarterly Guide to U. S. Elections
New York Times
Convention Decisions and Voting Records - Bain & Parris
USA Today [Link]
Most votes received by candidates for party presidential nomination, up to the point where a nominee was determined. Vote totals are rounded up to the next whole number.
The 9th Democratic Party National Convention assembled in the Amphitheatre in Chicago IL. It nominated Gen. George B. McClellan for President on the first ballot as shown here and George Pendleton unanimously for VP.