The numbers disclosed by the Yes on 23 campaign reflected the continued backing of three out-of-state oil companies — Valero Corp. and Tesoro Corp. of Texas, and Flint Hills Resources, a Wichita, Kan.-based company owned by Koch Industries.
The companies contributed a combined $5 million during the period ending September 30.
In all, the campaign has raised $8.3 million during the first nine months of the year and has $3.1 million remaining cash on hand.
Opponents of the initiative said they expected the petroleum industry to keep pouring money into Proposition 23 before the November 2 vote.
