Using OpenID in ASP.Net MVC3, where do I get the user data?

I realize OpenID is somewhat of a behemoth, or more complex than a typical registration form, but I feel I'm missing something here.

According to this question, I'm supposed to save the unique identifier key I'm given by my provider.

The provider will give you a unique ID for each user - this you need to save. It's how you will match up the user that just logged in with a record in your database.

In my code (taken from the MVC portion), this unique ID is given inside the switch in the LogOn() action method:

public ActionResult LogOn()
{
    var openid = new OpenIdRelyingParty();
    IAuthenticationResponse response = openid.GetResponse();

    if (response != null)
    {
        switch (response.Status)
        {
            case AuthenticationStatus.Authenticated:
                FormsAuthentication.RedirectFromLoginPage(
                    response.ClaimedIdentifier, false);  // <-------- ID HERE! "response.ClaimedIdentifier"
                break;
            case AuthenticationStatus.Canceled:
                ModelState.AddModelError("loginIdentifier",
                    "Login was cancelled at the provider");
                break;
            case AuthenticationStatus.Failed:
                ModelState.AddModelError("loginIdentifier",
                    "Login failed using the provided OpenID identifier");
                break;
        }
    }

    return View();
}

[HttpPost]
public ActionResult LogOn(string loginIdentifier)
{
    if (!Identifier.IsValid(loginIdentifier))
    {
        ModelState.AddModelError("loginIdentifier",
                    "The specified login identifier is invalid");
        return View();
    }
    else
    {
        var openid = new OpenIdRelyingParty();
        IAuthenticationRequest request = openid.CreateRequest(Identifier.Parse(loginIdentifier));

        // Require some additional data
        request.AddExtension(new ClaimsRequest
        {
            BirthDate = DemandLevel.NoRequest,
            Email = DemandLevel.Require,
            FullName = DemandLevel.Require
        });

        return request.RedirectingResponse.AsActionResult();
    }
}

Do I use this identifier for the FormsAuthentication.SetAuthCookie(IDHERE, true);?

What if I want to also save the users information, such as email, name, nickname or whatever. How do I get this collection of data from the relying party? In case this process depends on the provider I'm using, I am using Steam OpenID provider:

http://steamcommunity.com/openid http://steamcommunity.com/dev