WASHINGTON (AP) -- Every American should have health care coverage within six years, Democratic Sen. Barack Obama said Thursday as he set an ambitious goal soon after jumping into the 2008 presidential race. "The time has come for universal health care in America," Obama said at a conference of Families USA, a health care advocacy group. "I am absolutely determined that by the end of the first term of the next president, we should have universal health care in this country," the Illinois senator said. Obama was previewing what is shaping up to be a theme of the 2008 Democratic...