Seeking to lock down votes before a meeting of the Senate Finance Committee, Chairman Max Baucus began reworking his healthcare overhaul to ease the financial burden on middle-class Americans who would be required for the first time to have health insurance. Baucus said that his revised bill would offer more generous subsidies to low- and middle-income people to buy coverage through a network of private insurance exchanges. He also said he may cut the maximum penalty facing middle-class families who do not buy insurance.