Newsweek has released a poll showing that former general Wesley Clark, who announced his run for the White House last week, would beat President Bush in a head-to-head race by a 49 to 46 percent margin. Clark polled better than his nine Democratic counterparts. In other campaign news, Senator Carol Moseley Braun, who is the only African-American woman to serve in the US Senate, officially declared her candidacy for president yesterday calling for a “partnership for peace, prosperity and progress.”