A vigil outside the University Medical Center - Arizona in Tucson, Tuesday, Jan. 11, 2011. Charlie Riedel/ASSOCIATED PRESS hide caption itoggle caption Charlie Riedel/ASSOCIATED PRESS It's All Politics Obama In Tucson To Call For Unity But What Else? January 12, 2011 Besides calling for unity, Obama can be expected to eulogize the dead and praise the heroes. But will he say anything about mental illness? And how much can he say?