[CentOS] Help with at Bash script

I am attempting to get a script borrowed from DJB to work on my CentOS-6.6 box. Simplified it looks like this:

tcpdump -l -n -e port 53 \ | awk '{if ($14 ~ /A.*?/) print $15}' \ | while read domain ; do echo $domain ; done ;

The sticking point is the 'while read' construct. Run just as 'tcpdum | awk' I get this:

english.stackexchange.com. www.urbandictionary.com. www.urbandictionary.com. www.urbandictionary.com. www.urbandictionary.com. api.mywot.com. a.udimg.com. a.udimg.com. fonts.googleapis.com. . . .

Run with the 'while read $domain ; do echo ' pipe nothing appears whatsoever. What am I doing wrong?