::::I second Jaakko's sentiments about the inapplicability of WP:TRUTH to this discussion. Perhaps Lacunae has once or twice made side arguments that the Danish People's Party "really" is mainstream (and comments in Talk pages should not be held to the same standard as edits to articles), but I cannot recall Jaakko or myself making claims about what is "really" the case without reference to reliable sources. 
 ::::While I appreciate that Jeppiz is trying to "establish as accurate a picture" as possible, it remains the case that his proposed edit attempts to do so by "covering the coverage", which I still maintain should be avoided when possible. 
 ::::Again, I understand and recognise that the ECR has changed composition somewhat following the 2014 elections, and the lead does mention the largest parties currently in the group. However, if we are to make the case that the character of the group as a whole has changed, I think we need to find a WP:RS that says so, and is authoritative (and this would probably be a detail that wouldn't belong in the lead anyways). Given that it's only been a few months since the 2014 election, it isn't surprising there haven't popped up such authorities.