Plaid Cymru visited Cardiff Central railway station as part of the launch
Plaid Cymru has launched its European election manifesto with a stinging attack on the record of Labour MEPs.
Adam Price MP said the record of Glenys Kinnock and Eluned Morgan, who are standing down, was shameful and disastrous.
Mr Price, Plaid's director of elections, said they had failed to stand up for Wales.
Plaid's manifesto stresses greater support for broadband and transport links with the rest of Europe.
Mr Price said: "It almost beggars belief that when Jill (Evans) is fighting and winning official status for Welsh, Labour are doing all they can to undermine them. Shame on them."
He added: "Look at their record, and it almost seems as if they're ashamed of their Welshness, look at the way they perform in the European Parliament and it seems as if where they come from, where they're supposed to represent is something they're trying to hide."
Plaid Cymru MP Adam Price said the party was coming of age
Party leader Ieuan Wyn Jones told a news conference in Cardiff that Plaid Cymru had set its sights on winning two seats in the European Parliament in the poll on 4 June.
At present, the party has one seat, held by Jill Evans.
"With Labour in meltdown, we want two members of the European Parliament to represent Wales," he said.
"We have a proven track record of success in standing up for Wales in the European Parliament, whilst the other parties regularly vote against Welsh interests or show indifference."
The manifesto says Plaid Cymru want to see every community in Wales able to access high broadband speeds.
The party also want compulsory network sharing between mobile phone companies in Wales.
Plaid is also calling for a windfall tax on energy companies' profits and a Europe-wide suspension of VAT on domestic gas and electricity for the next two years.
Jill Evans said: "Over the past five years, we have worked hard in Europe to put Wales on the map. We can be proud of what we have achieved."
Plaid also repeated the party's aim of Wales becoming an independent member of the European Union.
The party proposes as an interim measure that Wales' First Minister has the right to attend Council of Ministers' meetings as an observer with speaking rights.
The manifesto also focused on the green agenda of the party, and called for an EU commitment to an annual 9% carbon emissions reduction target.
Plaid also reaffirmed opposition to building new nuclear power stations in Wales.
Mr Price, who is MP for Carmarthen East and Dinefwr, said the row over MPs' expenses showed Westminster was "dysfunctional" and said there should be complete transparency of expenses.
He confirmed he did claim second home allowance to live in London.
To restore confidence in the financial system, Plaid Cymru called for a Europe-wide minimum state guarantee on saving of 150,000 euros.
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