polling firm                  date of polling  link  progressive conservative  liberal  new democratic
0    corporate research associates  september 29 - october 3 , 2011  html                        59       16              25
1                       environics  september 29 - october 4 , 2011  html                        54       13              33
2   marketquest omnifacts research         september 28 - 30 , 2011  html                        54       13              33
3   marketquest omnifacts research         september 16 - 19 , 2011  html                        53       18              29
4    corporate research associates            august 15 - 31 , 2011   pdf                        54       22              24
5    corporate research associates               may 11 - 28 , 2011   pdf                        57       22              20
6    corporate research associates          february 10 - 28 , 2011   pdf                        73       18               8
7    corporate research associates           november 9 - 30 , 2010   pdf                        75       16               8
8    corporate research associates            august 10 - 30 , 2010   pdf                        76       17               7
9    corporate research associates               may 11 - 31 , 2010   pdf                        75       16               8
10   corporate research associates           february 9 - 25 , 2010   pdf                        80       15               5
11   corporate research associates           november 5 - 22 , 2009   pdf                        77       16               7
12   corporate research associates            august 11 - 29 , 2009   pdf                        77       15               8
13   corporate research associates               may 12 - 30 , 2009   pdf                        72       19               8
14   corporate research associates          february 11 - 28 , 2009   pdf                        71       22               7
15   corporate research associates   november 5 - december 2 , 2008   pdf                        72       19               9
16   corporate research associates            august 12 - 30 , 2008   pdf                        78       14               7
17   corporate research associates            may 8 - june 1 , 2008   pdf                        77       13               8
18   corporate research associates     february 12 - march 4 , 2008   pdf                        79       14               6
19   corporate research associates   november 9 - december 3 , 2007   pdf                        82       12               7

Table as JSON:
{"polling firm":{"0":"corporate research associates","1":"environics","2":"marketquest omnifacts research","3":"marketquest omnifacts research","4":"corporate research associates","5":"corporate research associates","6":"corporate research associates","7":"corporate research associates","8":"corporate research associates","9":"corporate research associates","10":"corporate research associates","11":"corporate research associates","12":"corporate research associates","13":"corporate research associates","14":"corporate research associates","15":"corporate research associates","16":"corporate research associates","17":"corporate research associates","18":"corporate research associates","19":"corporate research associates"},"date of polling":{"0":"september 29 - october 3 , 2011","1":"september 29 - october 4 , 2011","2":"september 28 - 30 , 2011","3":"september 16 - 19 , 2011","4":"august 15 - 31 , 2011","5":"may 11 - 28 , 2011","6":"february 10 - 28 , 2011","7":"november 9 - 30 , 2010","8":"august 10 - 30 , 2010","9":"may 11 - 31 , 2010","10":"february 9 - 25 , 2010","11":"november 5 - 22 , 2009","12":"august 11 - 29 , 2009","13":"may 12 - 30 , 2009","14":"february 11 - 28 , 2009","15":"november 5 - december 2 , 2008","16":"august 12 - 30 , 2008","17":"may 8 - june 1 , 2008","18":"february 12 - march 4 , 2008","19":"november 9 - december 3 , 2007"},"link":{"0":"html","1":"html","2":"html","3":"html","4":"pdf","5":"pdf","6":"pdf","7":"pdf","8":"pdf","9":"pdf","10":"pdf","11":"pdf","12":"pdf","13":"pdf","14":"pdf","15":"pdf","16":"pdf","17":"pdf","18":"pdf","19":"pdf"},"progressive conservative":{"0":59,"1":54,"2":54,"3":53,"4":54,"5":57,"6":73,"7":75,"8":76,"9":75,"10":80,"11":77,"12":77,"13":72,"14":71,"15":72,"16":78,"17":77,"18":79,"19":82},"liberal":{"0":16,"1":13,"2":13,"3":18,"4":22,"5":22,"6":18,"7":16,"8":17,"9":16,"10":15,"11":16,"12":15,"13":19,"14":22,"15":19,"16":14,"17":13,"18":14,"19":12},"new democratic":{"0":25,"1":33,"2":33,"3":29,"4":24,"5":20,"6":8,"7":8,"8":7,"9":8,"10":5,"11":7,"12":8,"13":8,"14":7,"15":9,"16":7,"17":8,"18":6,"19":7}}