if nothing is specified, just use latest session
if nothing is specified, just use latest session

sunlightlabs/billy,loandy/billy,sunlightlabs/billy,openstates/billy,mileswwatkins/billy,openstates/billy,loandy/billy,mileswwatkins/billy,loandy/billy,mileswwatkins/billy,openstates/billy,sunlightlabs/billy