Latest changes

Vince,
Here are a few more additions: a revised productivity plot and updated results section. I'll finish the discussion and draft intro/conclusion Friday am. 

There are a few changes to the R file. Mostly, the correction I mentioned before and a little playing around with lattice plots. I'm still searching for a better way to portray the faceted plots for votes/satisfaction/laws by number of additional provisions. 

I'd forgotten that the kids have a half-day at school for parent-teacher conferences---so I'm not going to make it to campus.