I think it’s in reference to how bi people are often told they are being “greedy” for wanting all/both sexes rather than just having the '“one” the speaker expects. This usually then leads to the misguided conclusion that they are promiscuous and unfaithful - https://lgbtqiacounseling.com/bisexual/bisexual-stereotypes/#Bisexuals_are_Greedy_or_Unable_to_Commit
Congratulations on registering to vote!
If you haven’t already, you should look up a sample ballot for your specific state/city so you can know who all these people are and/or what the actual proposals. I was a bit overwhelmed by all the non presidential questions the first time I voted. So now I research before and take my little paper list in with me so I don’t have to think/decide in that moment while at the poll.