Squeaky talks about some funny business in the Texas legislature, in regards to votes legislators cast, or rather, cast for other members who are absent. I think the rules of the legislative body in Texas needs to be changed to stop this from happening, but this probably doesn’t mean the legislator is voting twice. Remember, these votes are on record, and it one of their colleagues comes up on record as having voted for something he needed to be against for political reasons, you can imagine the trouble that would cause.
What is likely happening here, is legislators are casting votes on their colleague’s behalf. I agree this should change, but not because it’s double voting, but because it’s lazy and unprofessional.  If you want to cast a vote, at the very least, you should show up. Otherwise, how are the folks back home to know how uninvolved you are?