CBS links to the poll data in a PDF:

CBS NEWS/KNOWLEDGE NETWORKS POLL

For release: January 27th, 2010
FOR IMMEDIATE RELEASE

…
SPEECH VIEWERS AND PARTY AFFILIATION

Americans who watched the speech are more Democratic than the nation as a whole. That is not surprising; historically, a President’s supporters are more likely than his opponents to watch State of the Union addresses. 44% of speech viewers in this poll are Democrat and 21% are Republican. In the most recent CBS News poll of all Americans, conducted January 14-17, 2010, the breakdown is more even between the parties: 36% Democrat and 28% Republican.

SPEECH VIEWERS AND AMERICANS’ PARTY AFFILIATION

Democrat 44% - Viewers and 36% - All Americans
Republican 21 - Viewers and 28 - All Americans
Independent 35 - Viewers and 36 - All Americans

Knowledge Networks and Gallup have similar numbers with regards to party affiliation 36 (D), 28 (R), 36 (I) and 34 (D), 28 (R), 36 (I). However, as you can see the “Speech Viewers” was weighted towards Democrats (44% Democrats vs. 21% Republicans).