Voting Intentions

In a conversation yesterday, someone said that up to 20% of SNP voters were going to vote "No" in #indyref. Presumably because they like most SNP policies but not independence, or they voted SNP as a protest.

My curiosity piqued, I found this Ipsos MORI post on voting intentions, which shows c 20% SNP voters are either voting "no" or "don't know".

http://www.ipsos-mori.com/contactus/offices/scotland/indyref2014/polling/votingintention/partysupport.aspx