As Senator Barack Obama prepares to accept the Democratic presidential nomination next week, party leaders in battleground states say the fight ahead against Senator John McCain looks tougher than they imagined, with Mr. Obama vulnerable on multiple fronts despite weeks of cross-country and overseas campaigning.

These Democrats — 15 governors, members of Congress and state party leaders — say Mr. Obama has yet to convert his popularity among many Americans into solutions to crucial electoral challenges: showing ownership of an issue, like economic stewardship or national security; winning over supporters of Senator Hillary Rodham Clinton; (more...)