Here's how the vote worked:
To cast a vote you called the number provided. Entered your PIN and VIN. Then you got to choose... option 1: ALPA option 2: write in vote for representation other than ALPA (could be Teamsters, SAPA, your uncle Joe, Mickey Mouse, whoever). There was no option to vote against representation.
When the vote was finished, ALL votes were tallied. If the majority of the eligible voters called in and voted (meaning 50% + 1 of the 2611) then the vote would have passed and we would have had representation. Then, to decide who represented us, the would have tallied all the votes for ALPA, all the votes for Teamsters, all the votes for SAPA, yada yada yada, and the majority of those votes would have been who the representative party was that won the vote.
So, yes, in a way, a vote for SAPA was a vote for ALPA. Most likely, the majority of yes votes was going to be for ALPA, but that vote for SAPA helped to reach the 50% + 1 magic number. In the final breakdown there were a few votes for SAPA and the Teamsters but the vast majority were for ALPA.
Unfortunately, about 65% voted AGAINST representation either by purposely not calling (as a "NO" vote), or just being apathetic. There is no way to tell the difference.
Hope this helped.
--SP