[support] voting more than once on polls

[Christopher M. Jones]

I need to allow users to vote more than once on the same poll. Sensibly, 
both the poll and advanced poll modules seem to assume that the user can 
vote only one time, and don't appear to offer an option to make it 
otherwise.

As far as I can tell, these are the only two polling modules out there, 
amidst the slew of voting modules.

1. How easy would it be to hack one of the two extant poll modules to 
permit multiple votes per user?

2. Is there another option? Say, another module that could be adapted 
for poll-like behavior, that would allow multiple votes?