Gov. John Baldacci wants to use $15 million made available through the federal stimulus package to help an estimated 8,000 unemployed Mainers maintain health care insurance. Under the proposal, eligible laid-off workers would receive vouchers to help pay for continued employer-based coverage through the Consolidated Omnibus Budget Reconciliation Act, known as COBRA. A subsidy would be made available to laid-off workers whose employers were too small – fewer than 20 employees – to fall under COBRA requirements. The assistance would be limited to nine months.