MVC 1- Model Binding With Disabled Textbox?

I have a textbox that I am defining as

<%= Html.TextBox("Username", Model.Form.Username,
new { @class = "textbox", @disabled = "disabled" })%>

In my action

[AcceptVerbs(HttpVerbs.Post)]
[ValidateAntiForgeryToken]
public ActionResult EditLogin(LoginForm post) {
return View(model);
}

post.Username will be blank, all other properties bind correctly, but if I change @disabled="disabled to @readonly="readonly" the username binds properly and everything works. It looks like model binding ignores values in disabled fields. Is their a way around this? I still need the field's value to bind to the model. I can use readonly but would prefer to use disabled so it is visually apparent to the user that they cannot edit the value of the field.