SecureID vs Certificates

["Tony Miedaner" <miedaner () twcny rr com>]

Hi Folks,

Kind of a high level questions on trade offs between SecureID or Certificates.  It would seem pretty obvious that 
SecureID is a better system BUT for many situations it would seem to me that certificates would be a reasonable form of 
two factor authentication.  Can anyone provide a good reason why not to use certificates over SecureID?

Is it even reasonable to classify certificates as two factor?

It is understood that if someone can take control your computer they may be able to use the cert.

Any insight is much appreciated as always:-)