President Bush has once again vetoed a bill that would extend government healthcare to millions of low-income children. It’s the second time Bush has nixed a $35 billion expansion to State Children’s Health Insurance Program, known as S-CHIP. Wednesday was Bush’s deadline to act on the measure or let it become law. He vetoed the bill in private, as he did in October. The House will vote in January on whether to override the veto after falling short of the required two-thirds majority. The Senate version of the bill passed by a veto-proof margin last month.