When did it become optional for senators and governors to go to

Court House - When did it become optional for senators and governors to go to work? Sanders, Cruz, Rubio, Christie and Kasich haven't seen their workplaces in months. The campaign season is far too long and saps millions of dollars. Think about it; what if we had put all those corporate and personal contributions into our schools, our roads, our bridges? If the Super PACs are so concerned about America, why don't they contribute to the real needs of our country instead of running non-stop, annoying political ads?