I know the feeling.
The TV feed for Thom's afternoon radio show often is not available on Livestream at http://www.livestream.com/thomhartmann at the beginning. They sometimes are still playing the replay from the previous show when Thom has begun today's program, and do not come live until a few minutes later.
I just checked (an hour and a half into the show ... i was occupied earlier) and they have Thom now.
If Livestream does not have Thom live at the beginning of the show, or at any other time he is on the air, an alternative on the web for live video of his afternoon show is Free Speech TV at https://www.freespeech.org/.