In a move that suggests its initial rescue plan was insufficient, the Obama administration yesterday announced plans to widen the eligibility parameters of a key housing initiative. The change would allow borrowers with mortgages valued at 125 percent of their home’s worth to refinance into more affordable loans. Previously, only borrowers with so-called loan-to-value ratios of 105 percent or less could do so. The mortgage refinancing program is part of the president’s two-pronged plan to pull the nation out of its worst housing slump since the Great Depression. Coupled with efforts to modify troubled mortgages, the government believes its Making Home Affordable initiative can reach up to 9 million American homeowners. “The president’s Making Home Affordable plan is already helping far more families than any previous foreclosure initiative, and with today’s announcement we will extend its reach still further,” Housing and Urban Development Secretary Shaun Donovan said.