We aren’t voting for or against independence in the European Parliament elections today. However, that doesn’t mean they aren’t relevant from an indyref perspective.
First of all, and most obviously, the media will look at the strength of the Yes parties and try to conclude that this says something about the strength of the Yes campaign. In other words, if the SNP and the Green party together win three (or more) of the six seats available, everything is fine. On the other hand, if they only get two, it will be seen as a blow to the Yes campaign.
Secondly, UKIP must not win a seat here. They have been trying extremely hard to present themselves as a UK-wide party, but they have never saved a deposit in Scotland, and it’s important for the distinctiveness of Scottish politics that the status quo in this area is maintained, apart from the obvious fact that UKIP is an abhorrent party.
Thirdly, the Scottish MEPs will sit in the European political party groups in the European Parliament. For instance, the SNP and the Green Party will both form part of Greens/EFA, Labour will sit in S&D, the Tories in ECR (not in the EPP!), and the LibDems (if they get in) in ALDE. The MEPs normally vote the same within each group, so it’s really important to look into this rather than simply assuming the MEPs will be toeing the national party line. The European political parties are not equally keen on Scottish independence, as became clear when the Spitzenkandidats were questioned about this on TV:
It’s clear that the Greens/EFA group is the only one that strongly supports Scottish independence.
Fourthly, it’s likely that when the Scottish number of MEPs is increased from 6 to 13 after independence, the additional parliamentarians will be found using the results from this election, rather than holding a by-election. This makes it even more important to elect candidates who will do their utmost to represent an independent Scotland well on the European stage.
To summarise, the best way to support a Yes vote and to further Scottish independence in the European Parliament is to vote for either the SNP or the Green Party. These two parties sit in the same political group in Brussels and Strasbourg, so in practice the difference between the two is minor in this context. It’s probably more important to weigh up whether it’s more likely that the SNP will win three seats or that the Greens will win one. This has been explored with great clarity by Lallands Peat Worrier.