A bipartisan panel created by President Obama after many voters waited hours to cast ballots in 2012 on Wednesday recommended ways to keep delays to no more than a half-hour. But changes are up to the states and 8,000 local jurisdictions, where voting laws have been a partisan battleground since the 2000 presidential recount. After surveying local officials, the commission also warned of two potential crises: Voting machines bought a decade ago, when federal funds were made available as a post-recount remedy, are breaking down or obsolete. And local schools, long a favored polling place and accessible to the disabled, increasingly are unavailable as more of them restrict entry in response to shootings like the massacre in Newtown, Conn. Mr. Obama noted in his 2012 victory speech that some voters were still in line that night, even as he spoke, and then announced the 10-member commission a year ago in his State of the Union address. He received the report, six months in the making, at the White House from the panel’s co-chairmen — Robert F. Bauer, a Democrat, and Benjamin L. Ginsberg, a Republican, the top lawyers for his own and Mitt Romney’s 2012 campaigns. The panel also included executives, academics and state and local officials.