as weluv said, you're lumbered with him cos people stayed at home and didnt bother voting. Also add in the proportional representation system of Euro Voting and you have your reason.
then again, you could always blame Thatcher...

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from Nick Robinsons BBC blog...
Nick Griffin is now a Member of the European Parliament even though he won fewer votes than he did five years ago.
That's right, fewer.
In 2004, the BNP in the North West polled 134,959 votes.
In 2009, they polled 132,194. So, why did he win?
In short, because of a collapse in the Labour vote from 576,388 in 2004 to 336,831 in 2009. In Liverpool, Labour's vote dived by 15,000; in Manchester by almost 9,000; whilst in Bury, Rochdale and Stockport, its vote halved.
The switch away from postal votes for all in the last Euro election in the region also led to a fall in turnout.
Thus, the BNP could secure a higher share of the vote whilst getting fewer votes.