If Schroeder wants to put his money where his mouth is, he will call for a VOTE in Germany to show the rest of Europe how a good leader gets the correct "YES" vote from the people instead of having the legislature do it for them. But it would likely fail in Germany too. Schroeder is a slimeball and the sooner he is out of office the better for Germany.
I really hope the voters in Germany also turn in a resounding 'no' vote, since it might just send the correct & over due signal to the voters, it's time for a real change in a number of E.U. capitols. Back to common sense and end the European banking elites pushing for an E.U. superstate, which down the road the wrong crowd could gain total control over. We have already been through two world wars, know what I mean.
It appears that he couldn't even if he wanted to, since the German constitution (largely the creation of the allies after WWII) explicitly forbids referendums. I believe there was some discussion of amending their constitution to change this, but I don't know how difficult that would have been - as difficult as changing any constitution, presumably.