ADFS 2.0 authentication

I need to authenticate to o365 but all I have is the username.    The user will authenticate to the website but after that I do not store the password.    Is there a way that I can authenticate to ADFS 2.0 without the password (maybe : urn:oasis:names:tc:SAML:2.0:ac:classes:X509)?  

I have done something like this before when I created my SAML token when I created it using JAVA or C# but not using ADFS 2.0.

Thanks in advance.

Thanks in advance