I agree it is not THE reason, but money in politics basically affects everything at this point.
Ok let's play.
Is Sanders corrupted by money in politics?
My only honest answer is that from my perspective he seems to be less corrupt than most and definitely less than those currently running. From my perspective I wish donations were not necessary at all to run and that money was as small of a barrier as possible. By taking money largely (mostly? ) from citizens and not corporations he is corrupt than someone who takes money from corporations. Does he take money from rich people? What is the average donation? What is the largest single donation? His metrics for these are much much better for Sanders. In a perfect scenario donations would be proportional to your constituency. No one person can donate a disproportionate amount in order to amplify their influence to both others and the politicians themselves.
http://www.fec.gov/disclosurep/pnational.do
Amazing website.
Clinton
Size of Contributions
$200 and Under $34,778,487
$200.01 - $499 $4,927,936
$500 - $999 $5,716,745
$1000 - $1999 $13,603,063
$2000 and Over $71,156,509
Sanders
Size of Contributions
$200 and Under $80,626,723
$200.01 - $499 $5,062,931
$500 - $999 $3,793,297
$1000 - $1999 $3,297,690
$2000 and Over $1,981,339
No let's go into these $2000 and over in more detail
https://www.opensecrets.org/politicians/contrib.php?cid=N00000019&cycle=Career
Clinton
Contributor, total, individual, pacs
Emily's List $939,881 $930,961 $8,920
Citigroup Inc $883,547 $875,547 $8,000
DLA Piper $847,930 $820,930 $27,000
Goldman Sachs $821,031 $811,031 $10,000
JPMorgan Chase & Co $771,111 $768,111 $3,000
Morgan Stanley $754,538 $749,538 $5,000
University of California $608,858 $608,858 $0
Time Warner $591,524 $566,524 $25,000
Skadden, Arps et al $522,688 $518,188 $4,500
Corning Inc $492,750 $474,750 $18,000
Kirkland & Ellis $443,420 $426,420 $17,000
Paul, Weiss et al $427,062 $427,062 $0
Greenberg Traurig LLP $411,640 $403,540 $8,100
Sullivan & Cromwell $396,625 $396,625 $0
Akin, Gump et al $393,531 $390,031 $3,500
National Amusements Inc $366,640 $363,640 $3,000
21st Century Fox $363,899 $363,899 $0
Lehman Brothers $362,853 $359,853 $3,000
Here is Sanders.
https://www.opensecrets.org/pres16/contrib.php?cycle=2016&id=N00000528&type=f
By my own standards then:
Is he completely squeaky clean "uncorrupt"? no.
Is he less corrupt than Clinton, and most high profile politicians. Ho boy. You betcha.