People Before Profit has unveiled a banner across the Ha'penny Bridge, calling for an end of 100 years of Fine Gael and Fianna Fáil in government.
Party leader, Richard Boyd-Barrett, said the election is not over before it has even started.
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"I think people want change, and we shouldn't buy the narrative that Fianna Fáil and Fine Gael are just going to waltz back in," he said.
"I think there'll be a very different dynamic in this general election when people focus on the things that matter.
"We're saying if we get rid of Fianna Fáil and Fine Gael, there is a possibility for real change and a left government."