How could Conservative MEPs vote not to respect the result of Ireland's referendum?

JUST HOW CAN THIS VOTE BE JUSTIFIED??

Only one MEP Tory member of the EPP is reported to have supported this Amendment 32 which required the European Parliament to respect the result of the Irish Referendum.

Why are the Tories still members of the EPP, led by Hans-Gert Poettering who on Radio 4 this morning claimed powerlessness to publish details of fraud in the EU parliament.

How dare David Cameron continue the farce of the sham procedures in parliament on the Lisbon Treaty?

How dare David Cameron claim he favours a referendum for the people of Britain on this disgraceful Treaty, that he will not 'let matters rest there', yet allows his own party members in Strasbourg to vote to disregard the democratically voiced will of the Irish people should they choose to consign this constitution to the rubbish bin of history where it properly belongs in any institution pretending democratic credentials????