WASHINGTON — As they tell the story in Texas, when George W. Bush was governor, he fought hard to put austere limits on a new federal-state plan to provide health insurance for children of low-wage workers in the state. Outmaneuvered by Democrats, he corralled the program's chief sponsor on the statehouse floor and conceded defeat, saying, "You crammed it down our throats." Now, almost 10 years later, President Bush is threatening to veto federal legislation that would renew the same partnership — the State Children's Health Insurance Program — and expand it to cover more of the nation's nearly 9...