A new national poll shows that 53 percent of Americans favor ending marijuana prohibition, with support coming from all across the political spectrum: 61 percent among Democrats, 55 percent among Independents and 43 percent among Republicans.  This latest poll shows support to be 9 percent higher than a Gallup poll released in October, which showed that 44 percent of Americans favored making marijuana legal. The new poll conducted last week by Angus Reid Public Opinion also reveals that 68 percent…