President Barack Obama declared Wednesday that congressional Republicans are pushing a radical plan to trim Medicare and Medicaid, ramping up the rhetoric before a friendly Facebook crowd at the headquarters of the popular social networking site. Still, as Obama and Congress approach crucial decisions on spending and the national debt the president said he thinks a bipartisan accord is possible. “I think it’s fair to say that their vision is radical,” Obama told a town hall gathering that included questions posed by Facebook founder Mark Zuckerberg and sent in by site users. “I don’t think it’s particularly courageous,” he said of the GOP plan to convert Medicare to a voucher program and make big cuts to the federal-state Medicaid program for the poor. “Nothing is easier than solving a problem on the backs of people who are poor, or people who are powerless, or don’t have lobbyists, or don’t have clout,” Obama said.