The National Assembly will today debate a proposal to charge a 5p levy on chewing gum to help pay for the cost of cleaning it up.
It's been estimated that discarded chewing gum costs councils across the UK over £100m every year.
Carmarthen Council is cracking down on the problem and recently issued its first £75 fine. They say cleaning it up costs them £30,000 a year.
But confectionery firms and critics say it would unfairly punish consumers.
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Crowds came to hear him speak this afternoon in Bangor - a seat where fewer than 100 votes could make the difference at the next election.
Scattered showers with the odd heavy burst possible but there will be plenty of sunny spells too.
A rather wet and windy evening, with rain in the north and showers elsewhere.