none 

Statements about this table:
september 17 - 18 , 2008 be the date administer in the survey usa poll source where republican christopher reed receive 37%
republican christopher reed receive 40% when the lead margin be smaller than 16
june 10 , 2008 be the date administer when the lead margin be smaller than 39 with republican christopher reed at 37% and democrat tom harkin at 53%
the date administer be april 21 - april 23 , 2008 , while the lead margin be 39 and the poll source be research 2000
in september 2008 , the survey usa poll have christopher reed at 37%
when the lead margin be 14 , republican christopher reed receive 40%
september 17 - 18 , 2008 be the date administer in the survey usa poll source where republican christopher reed receive 37% and be number 19 on the lead margin
for the poll source rasmussen report on august 7 , 2008 , democrat tom harkin have a 16 lead margin over republican christopher reed
republican christopher reed receive 40% when the lead margin be 16
june 10 , 2008 be the date administer when the lead margin be 39 with republican christopher reed at 37% and democrat tom harkin at 53%
from the poll source de moines register / selzer & co , democrat christopher reed have the lead by 53% on august 7 , 2008
54% be democrat : tom harkin 's percentage when the poll source be survey usa and the lead margin be 14
poll source
dates administered
democrat : tom harkin
republican : christopher reed
lead margin
survey usa
october 28 - october 29 , 2008
61%
35%
26
rasmussen reports
october 23 , 2008
57%
41%
16
rasmussen reports
september 25 , 2008
54%
40%
14
survey usa
september 17 - september 18 , 2008
60%
37%
23
des moines register / selzer & co
september 8 - september 10 , 2008
53%
34%
19
poll source
dates administered
democrat : tom harkin
republican : christopher reed
lead margin
rasmussen reports
august 7 , 2008
60%
36%
24
rasmussen reports
july 10 , 2008
55%
37%
18
rasmussen reports
june 10 , 2008
53%
37%
16
research 2000
april 21 - april 23 , 2008
59%
20%
39