The Massachusetts Senate race is shaping up to be the most expensive race in the country. Warren raised over $3 million in the last quarter, and is getting financial help from a super PAC - the newly created Rethink PAC - organized by labor and former aides to Massachusetts Gov. Deval Patrick. Brown, for his part, has a flush campaign account of his own, with $9.6 million cash-on-hand at the end of September. Brown finance director John Cook told committee members that Warren would likely spend between $18 million and $20 million on the race. Outside groups, he said, would likely drop another $25 million. Brown's camp says outside groups have already spent over $3 million against Brown.