The SDP won 35.7% of the vote, a 5.5% increase from the last election in 2006.
The " No to AV, Yes to PR", is backed by former SDP leader Lord Owen.
It is composed of progressive-minded independents and defectors from coalition members Sakigake and the Social Democratic Party (SDP).
In 1988 the Liberals and the SDP voted to merge, and Paddy Ashdown was elected leader in July.
The 7.8-million-member Rengo, the national federation of labor unions, has deserted the SDP and lined up behind the Democrats.
However, since the decline and extinction of the SDP, Liberal Democrat candidates here have struggled to make their mark.
BBC: NEWS | VOTE 2001 | RESULTS & CONSTITUENCIES | City of Durham
Their position subsequently changed - though not before some on the right of the party formed the new SDP.
And the SDP may face contempt-of-parliament proceedings for making incorrect claims about government health care expenditures during a select committee debate.
And the opposition group with the most seats in Parliament, the Singapore Democratic Party (SDP), is struggling with an internal split.
The centre challenged for the seat in 1983 when the SDP came within 2, 000 votes of unseating Labour s Dr Mark Hughes.
BBC: NEWS | VOTE 2001 | RESULTS & CONSTITUENCIES | City of Durham
The SDP, which has three MPs, signed a memorandum of understanding with the Singapore Malay National Organization to form a second camp.
The NSP and the Singapore People's Party (SPP), an SDP splinter group, comprise the third camp, which also includes three smaller parties.
The unions' stand will make it harder for the chancellor to get his proposals accepted by the SDP and onto the statute book.
Uniformed members of the U.S. military serving in designated combat zones are eligible to participate in the Department of Defense Savings Deposit Program (SDP).
Labour had held the West Yorkshire seat since 1974, except for a brief period in the 1980s when the sitting MP defected to the SDP.
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Before the 1981 Liberal-SDP merger, Cyril Smith admitted that he had initially wanted to strangle the Alliance at birth, but had later come to accept it.
But he is expected to resign and stand as an SPP candidate in his Potong Pasir constituency, where it is possible the SDP may field a candidate against him.
Former SDP secretary-general Chiam See Tong, whose feud with his successor Chee Soon Juan caused the SPP to split from the dominant opposition party, is still with the SDP.
Harold Wilson's promise of renegotiation followed by a referendum split Labour down the middle in the 1970s and led to the creation of the breakaway SDP in the 1980s.
When in 1987 they defected, disillusioned by low spending on schools, they turned first to the Liberal-SDP Alliance, the third party, before coming round to the charms of Tony Blair.
The party said on their website that the latest announcement was aimed "squarely at the SDP's efforts to harness the new technology to advance its platform in the upcoming general elections".
He also joked that the Lib Dem leader in the Lords, Lord McNally, a former MP for Labour and the SDP, was "in coalition with almost the only party he has never belonged to".
In 1990, the SDP candidate in the Bootle by-election came seventh, an event that was quickly followed by the demise of the party, with the majority of members joining the newly created Liberal Democrats.
Also in The Times, former Labour foreign secretary and SDP leader David Owen, calls it the speech of a "party leader, not a prime minister - it contains not one single idea and is all about British exceptionalism".
Last night the Lib Dem dissidents included several eminent figures - former leader Lord Ashdown, SDP founder Lady Williams, former SDP leader Lord Maclennan and the former Chair of the Social Security Select Committee (as it then was) Lord Kirkwood.
SDP, it still amounted to something.
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The seat did in fact return a Tory MP, Piers Merchant in 1983 (as a result of vote splitting between Labour and the SDP), although it was won back for Labour in 1987 by Jim Cousins, who has held it ever since.
BBC: NEWS | VOTE 2001 | RESULTS & CONSTITUENCIES | Newcastle upon Tyne Central
Mr Kennedy, who was the youngest MP in parliament when he won the Ross, Cromarty and Skye seat for the then Social Democratic Party (SDP) in 1983, went on to talk about the changes that have taken place since he was first elected.
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