CNN may be celebrating its 30th anniversary, but that’s about all they have to be happy about these days.

According to the latest Nielsen Media Research, MSNBC beat CNN in primetime in the first half of 2010 among both total viewers and in the key adult demographic. MSNBC also beat CNN in primetime for second quarter of 2010. Year to date, MSNBC is on track to beat CNN for the second year in a row among Adults 25-54 and for the first time ever among total viewers.

MSNBC’s “Morning Joe” is pacing to beat CNN for the year for the first time since 2000 in its time period. Meanwhile, CNN’s “Larry King Live” and “Campbell Brown” had their worst quarters ever among both Adults 25-54 and total viewers. This was CNN’s worst performance in primetime in nine years, since 2Q 2001.

CNN isn’t the only one losing viewers these days. Turns out all three major broadcast network evening news programs were down in 2Q 2010 compared to the same period last year.