The Republican-led House approved Tuesday another bill aimed at defunding parts of last year's huge health care overhaul, but the measure doesn't stand much of a chance in the Democratic-led Senate. The bill would eliminate funding available to states to help them create and set up the health marketplaces known as exchanges, where individuals and small businesses will be able to purchase health insurance starting in 2 1/2 years. Under the healthcare law, the health and human services secretary can grant funds to the states without going through the annual congressional budget process. The Congressional Budget Office says eliminating the funding would save money --since fewer people would get insurance from the exchanges. But it would also result in the federal government, rather than the states, running many of the exchanges itself. The vote split mainly along party lines, 238-183.