I have just uploaded a “pre-print” to SocArXiv with a very simple description of how the moderate left in Switzerland (partisans of the Socialists and the Greens) see immigration. The summary is available here: SocArXiv. It’s a pre-print is quotation marks, because it’s clearly not something I have (or will) submit to a proper journal in this form. I’ve put it online, though, to make it available (including the PSPP code to get the results — yes PSPP). You will find descriptive statistics (cross-tabulations) from the 2015 Swiss Electoral Study (SELECTS), and see that the moderate left is more open to foreigners than other respondents on all measures of attitudes and for all definitions of the moderate left used (probably not surprisingly).