well there are a few die hards at EWR that have been pushing for the union ever since I started working there 3 years ago. They are always pushing union authorization cards on people, especially new hires. Hell, the first guy to ask me was one those die hards. This guy was even in some pro union video that was sent to my house touting how great the IAM is. From what I can tell Continental's hubs(EWR, IAH, CLE) are where all the pro union rampers are. Its the outstations that seem to not care about it. From people I know who work in smaller stations, it seems like they have it made so that may be why they don't really care for having a union. Me I really don't care whether the ramp ever gets a union since I plan on moving onto aircraft maintenance by next year when I receive my a & p ratings. Also remember that I believe ticket agents would be included with the ramp and represented together if the union were to come in. They may also be the reason why the vote was so low last time too.
As for the union itself trying to get more members, Im pretty sure they'd love that. That means more $$$ for them. So for them the more the merrier.