A couple of readers have sent in similar observations:

Your quote from Ms. Walsh is: “His dream coalition includes decent Republicans and independents, along with young people, African-Americans and lots of new voters who’ve been turned off by the polarization of the Clinton-Bush years.”
What jumped out at me is the assumption that Republicans and independents who might vote for somebody else are, by definition, indecent. Of course, there is also the notion that young people are neither Republican nor independent, either. It’s not just a cliché, it’s empty-headed nitwitacy.

I’m just so used to anybody who isn’t a liberal Democrat being asked to document his decency for the likes of Walsh that it didn’t seem worth remarking.