Are Corporate contributions legally prohibited from donating funds to a candidate?

Question

What are the laws governing contributions and where can I view them?

http://en.wikipedia.org/wiki/Campaign_finance_in_the_United_States
Corporations and unions are prohibited from contributing directly to a candidate's campaign.

Clinton
http://www.opensecrets.org/pres08/search.asp?txtCID=N00000019&name=%28all%29&employ=%28any+employer%29&state=%28all%29&zip=%28any+zip%29&submit=OK&amt=c&sort=A

Obama
http://www.opensecrets.org/pres08/search.asp?txtCID=N00009638&name=%28all%29&employ=%28any+employer%29&state=%28all%29&zip=%28any+zip%29&submit=OK&amt=c&sort=A

Ron Paul
http://www.opensecrets.org/pres08/search.asp?sort=A&name=&state=&zip=&employ=&txtCand=&txtCID=N00005906&amt=c&txtSoft=N&cycle=2008

Answer 1

In the US, no. Corps. can and do contribute to candidates.