Making themselves visible in the lead up to crucial referendums on the European constitution.
The yes and no campaigns are in the final sprint ahead of voting in France on 29 May and in the Netherlands on 1 June.
In Paris a rally by the no campaign was organised in the centre of the city.
This as a new opinion poll suggested that 52 percent of those who have decided how to vote will reject the treaty.
Both camps have been trying to sway the undecided in the Netherlands as well.
The latest poll there suggests that 63 percent of people will vote no, with only 27 percent in favour.
In France, half a dozen successive polls in the past week have put the no campaign in the lead.
The new constitution was drawn up to make way for an enlarged Europe, but has provoked fierce debate about national sovereignty and power.