Welsh nationalist leader Leanne Wood insists her party, the SNP and the Greens could be kingmakers at the next general election.
Over the past year much has been said about Ukip's sudden rise and whether it could play a key role in keeping the Conservatives in power at Westminster.
But Plaid chief Ms Wood believes it is not those on the right who have made the forthcoming UK general election a multi-party affair.
The former probation officer told delegates at her party's conference in north Wales: "It's little wonder for so many people that not voting is now seen as the best expression democratic preference than participation.
"The options for people are from four subtly different shades of Westminster grey and four party leaders which look alike, sound alike and act alike. It's a false choice.
"But ironically it isn't the right that has made the forthcoming UK general election a multi-party affair, it's in the unprecedented earthquake that erupted in Scotland through the inspiring grassroots Yes campaign.
"There is every chance of a hung parliament after the next election. We said that would be the case ahead of the 2010 election.
"People are more likely to listen to us next time."
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