evidence: Money determines how widely each side can spread its message and introduce voters to their preferred candidates – and can be particularly helpful in lesser-known House and Senate races. [...] "The stakes of the election couldn’t be higher," Sarah Guggenheimer, spokesperson for the Democratic super PAC Senate Majority PAC, said in a statement. "Come November, voters will choose between Republican Senate candidates who only care about lining their own pockets or Democrats who will continue their work to lower costs, enshrine abortion protections, and invest in hardworking families."