poll source  sample size                date         democrat     republican
0          survey usa          520  mar 14 - 16 , 2008  hillary clinton    john mccain
1          survey usa          520  mar 14 - 16 , 2008     barack obama    john mccain
2   rasmussen reports          500  feb 17 - 18 , 2008  hillary clinton    john mccain
3   rasmussen reports          500  feb 17 - 18 , 2008     barack obama    john mccain
4          survey usa          506  feb 15 - 17 , 2008  hillary clinton    john mccain
5          survey usa          506  feb 15 - 17 , 2008     barack obama    john mccain
6          survey usa          501  jan 20 - 21 , 2008  hillary clinton  rudy giuliani
7          survey usa          501  jan 20 - 21 , 2008  hillary clinton  mike huckabee
8          survey usa          501  jan 20 - 21 , 2008  hillary clinton    john mccain
9          survey usa          501  jan 20 - 21 , 2008  hillary clinton    mitt romney
10         survey usa          501  jan 20 - 21 , 2008     barack obama  rudy giuliani
11         survey usa          501  jan 20 - 21 , 2008     barack obama  mike huckabee
12         survey usa          501  jan 20 - 21 , 2008     barack obama    john mccain
13         survey usa          501  jan 20 - 21 , 2008     barack obama    mitt romney
14         survey usa          523  dec 13 - 15 , 2007  hillary clinton  rudy giuliani
15         survey usa          523  dec 13 - 15 , 2007  hillary clinton  mike huckabee
16         survey usa          523  dec 13 - 15 , 2007  hillary clinton    john mccain
17         survey usa          523  dec 13 - 15 , 2007  hillary clinton    mitt romney
18         survey usa          523  dec 13 - 15 , 2007     barack obama  rudy giuliani
19         survey usa          523  dec 13 - 15 , 2007     barack obama  mike huckabee
20         survey usa          523  dec 13 - 15 , 2007     barack obama    john mccain
21         survey usa          523  dec 13 - 15 , 2007     barack obama    mitt romney
22         survey usa          506   nov 9 - 11 , 2007  hillary clinton  rudy giuliani
23         survey usa          506   nov 9 - 11 , 2007  hillary clinton  mike huckabee
24         survey usa          506   nov 9 - 11 , 2007  hillary clinton    john mccain
25         survey usa          506   nov 9 - 11 , 2007  hillary clinton    mitt romney
26         survey usa          506   nov 9 - 11 , 2007     barack obama  rudy giuliani
27         survey usa          506   nov 9 - 11 , 2007     barack obama  mike huckabee
28         survey usa          506   nov 9 - 11 , 2007     barack obama    john mccain
29         survey usa          506   nov 9 - 11 , 2007     barack obama    mitt romney
30         survey usa          495  oct 12 - 14 , 2007  hillary clinton  rudy giuliani
31         survey usa          472  oct 12 - 14 , 2007  hillary clinton  mike huckabee
32         survey usa          468  oct 12 - 14 , 2007  hillary clinton    john mccain
33         survey usa          464  oct 12 - 14 , 2007  hillary clinton       ron paul
34         survey usa          482  oct 12 - 14 , 2007  hillary clinton    mitt romney
35         survey usa          492  oct 12 - 14 , 2007  hillary clinton  fred thompson

Table as JSON:
{"poll source":{"0":"survey usa","1":"survey usa","2":"rasmussen reports","3":"rasmussen reports","4":"survey usa","5":"survey usa","6":"survey usa","7":"survey usa","8":"survey usa","9":"survey usa","10":"survey usa","11":"survey usa","12":"survey usa","13":"survey usa","14":"survey usa","15":"survey usa","16":"survey usa","17":"survey usa","18":"survey usa","19":"survey usa","20":"survey usa","21":"survey usa","22":"survey usa","23":"survey usa","24":"survey usa","25":"survey usa","26":"survey usa","27":"survey usa","28":"survey usa","29":"survey usa","30":"survey usa","31":"survey usa","32":"survey usa","33":"survey usa","34":"survey usa","35":"survey usa"},"sample size":{"0":520,"1":520,"2":500,"3":500,"4":506,"5":506,"6":501,"7":501,"8":501,"9":501,"10":501,"11":501,"12":501,"13":501,"14":523,"15":523,"16":523,"17":523,"18":523,"19":523,"20":523,"21":523,"22":506,"23":506,"24":506,"25":506,"26":506,"27":506,"28":506,"29":506,"30":495,"31":472,"32":468,"33":464,"34":482,"35":492},"date":{"0":"mar 14 - 16 , 2008","1":"mar 14 - 16 , 2008","2":"feb 17 - 18 , 2008","3":"feb 17 - 18 , 2008","4":"feb 15 - 17 , 2008","5":"feb 15 - 17 , 2008","6":"jan 20 - 21 , 2008","7":"jan 20 - 21 , 2008","8":"jan 20 - 21 , 2008","9":"jan 20 - 21 , 2008","10":"jan 20 - 21 , 2008","11":"jan 20 - 21 , 2008","12":"jan 20 - 21 , 2008","13":"jan 20 - 21 , 2008","14":"dec 13 - 15 , 2007","15":"dec 13 - 15 , 2007","16":"dec 13 - 15 , 2007","17":"dec 13 - 15 , 2007","18":"dec 13 - 15 , 2007","19":"dec 13 - 15 , 2007","20":"dec 13 - 15 , 2007","21":"dec 13 - 15 , 2007","22":"nov 9 - 11 , 2007","23":"nov 9 - 11 , 2007","24":"nov 9 - 11 , 2007","25":"nov 9 - 11 , 2007","26":"nov 9 - 11 , 2007","27":"nov 9 - 11 , 2007","28":"nov 9 - 11 , 2007","29":"nov 9 - 11 , 2007","30":"oct 12 - 14 , 2007","31":"oct 12 - 14 , 2007","32":"oct 12 - 14 , 2007","33":"oct 12 - 14 , 2007","34":"oct 12 - 14 , 2007","35":"oct 12 - 14 , 2007"},"democrat":{"0":"hillary clinton","1":"barack obama","2":"hillary clinton","3":"barack obama","4":"hillary clinton","5":"barack obama","6":"hillary clinton","7":"hillary clinton","8":"hillary clinton","9":"hillary clinton","10":"barack obama","11":"barack obama","12":"barack obama","13":"barack obama","14":"hillary clinton","15":"hillary clinton","16":"hillary clinton","17":"hillary clinton","18":"barack obama","19":"barack obama","20":"barack obama","21":"barack obama","22":"hillary clinton","23":"hillary clinton","24":"hillary clinton","25":"hillary clinton","26":"barack obama","27":"barack obama","28":"barack obama","29":"barack obama","30":"hillary clinton","31":"hillary clinton","32":"hillary clinton","33":"hillary clinton","34":"hillary clinton","35":"hillary clinton"},"republican":{"0":"john mccain","1":"john mccain","2":"john mccain","3":"john mccain","4":"john mccain","5":"john mccain","6":"rudy giuliani","7":"mike huckabee","8":"john mccain","9":"mitt romney","10":"rudy giuliani","11":"mike huckabee","12":"john mccain","13":"mitt romney","14":"rudy giuliani","15":"mike huckabee","16":"john mccain","17":"mitt romney","18":"rudy giuliani","19":"mike huckabee","20":"john mccain","21":"mitt romney","22":"rudy giuliani","23":"mike huckabee","24":"john mccain","25":"mitt romney","26":"rudy giuliani","27":"mike huckabee","28":"john mccain","29":"mitt romney","30":"rudy giuliani","31":"mike huckabee","32":"john mccain","33":"ron paul","34":"mitt romney","35":"fred thompson"}}