TREND: Do you approve or disapprove of the way Barack Obama is handling his job as President? App Dis DK/NA Jun 23, 2014 40 55 5 Mar 13, 2014 39 57 4 Dec 18, 2013 38 59 4 Jul 19, 2013 41 55 4 May 24, 2013 45 50 6 TREND: Do you approve or disapprove of the way Terry Branstad is handling his job as Governor? App Dis DK/NA Jun 19, 2014 54 37 9 Mar 12, 2014 55 35 10 Dec 17, 2013 58 32 10 Jul 18, 2013 51 33 16 May 23, 2013 49 31 20 TREND: Do you approve or disapprove of the way Chuck Grassley is handling his job as United States Senator? App Dis DK/NA Jun 23, 2014 62 30 8 Mar 13, 2014 62 27 12 Dec 18, 2013 60 30 10 Jul 18, 2013 59 29 12 May 23, 2013 52 33 15 TREND: Do you approve or disapprove of the way Tom Harkin is handling his job as United States Senator? App Dis DK/NA Jun 23, 2014 56 33 11 Mar 13, 2014 55 31 14 Dec 18, 2013 50 38 12 Jul 18, 2013 50 35 15 May 23, 2013 47 35 18