The group, called Europe of Freedom and Democracy, is headed by UKIP leader Nigel Farage.
"By ruling out a referendum, he leaves himself naked in the negotiations, " leader Nigel Farage said.
She was in the Hampshire constituency for a rally with supporters aided by Ukip leader Nigel Farage.
Ukip's leader Nigel Farage later told Sky News the prime minister's comments revealed "how disconnected he is".
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She was reacting to a call by UKIP leader Nigel Farage for an "amicable divorce" between Brussels and Britain.
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But as leader Nigel Farage has said he wants to poach their voters too, they're not dismissing the threat.
Energising Nigel Farage and UKIP to believe and to claim that they are a new force in national politics.
In the 2010 General Election Nigel Farage raised eyebrows yet again when he contested John Bercow's seat in Buckingham.
The leader of the UK Independence Party, Nigel Farage welcomed the "proper debate" about the UK's future within the union.
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The UK Independence Party is "fundamentally changing British politics" with its goal of "getting our country back", Nigel Farage has said.
The big question is whether it will be enough this time to create the political earthquake that Nigel Farage hopes for.
The website claimed that the story had been recycled from a speech given by the UK Independence Party Leader Nigel Farage.
Prime Minister David Cameron, Labour leader Ed Miliband and UKIP leader Nigel Farage have all visited the constituency since the campaign began.
Nigel Farage, one of the UKIP candidates seeking parliamentary power, dismissed the suggestion they had no chance in a first-past-the-post General Election.
There had been speculation that the leader of the UK Independence Party Nigel Farage might stand, but he has ruled himself out.
However UKIP leader Nigel Farage has said he will not be standing.
In past elections Nigel Farage asked voters to "lend us your vote", a tacit acknowledgement that voting UKIP was a temporary, protest vote.
The official Conservative line is that there will be no deal with UKIP and party leader Nigel Farage has spoken in similar terms.
No other parties have yet announced who their candidates will be, although UKIP leader Nigel Farage has said he will not be standing.
The Labour candidate said his party had been "re-invigorated" by the campaign, and UKIP leader Nigel Farage predicted a "big" swing to his party.
Mrs James, who joined UKIP in 2010, said she was "honoured" and party leader Nigel Farage said she would "stand up for ordinary communities".
They will each have plenty of opportunities to publicly debate the party's performance, and to make the case against the return of Nigel Farage.
Party leader Nigel Farage said Mrs Spencer had "vim and vigour".
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"Clearly a huge victory for David Cameron: looks like he's managed to increase the UK contributions, " its leader Nigel Farage said in a Twitter message.
The party's leader, Nigel Farage, said he was "very upset and very angry" about the decision and called for "heads to roll" at the council.
Ukip leader Nigel Farage was convinced that the UK would leave the EU as a consequence of events set in train by the UK veto.
On Friday UKIP's Nigel Farage said the prime minister was a "problem" for the Conservatives and some Tory MPs said there were lessons for the party.
The leader of the UK Independence Party Nigel Farage says he will decide within the next 24 to 48 hours whether to stand in the by-election.
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New leader Nigel Farage wants to broaden UKIP from a single-issue party to occupy ground vacated David Cameron's Conservatives on issues such as immigration, taxation and education.
BBC: NEWS | UK | England | Devon | Party over for UKIP in Plymouth
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