The Rasmussen Reports daily Presidential Tracking Poll for Tuesday shows that 26% of the nation's voters Strongly Approve of the way that Barack Obama is performing his role as president. Thirty-six percent (36%) Strongly Disapprove, giving Obama a Presidential Approval Index rating of -10 (see trends). The Presidential Approval Index is calculated by subtracting the number who Strongly Disapprove from the number who Strongly Approve. It is updated daily at 9:30 a.m. Eastern (sign up for free daily e-mail update). Updates are also available on Twitter and Facebook Overall, 49% of voters say they at least somewhat approve of the...