Aside from News Broadcasts, you may also wish to gain access to live or retrospective coverage of Federal Politics in Canada and the United States. Coverage can include Question Period / Debates, Committee Hearings, Briefings, and Press Conferences. CSPAN also has links to American History TV.
CPAC provides Canadians with access to videos related to Canadian Politics. These are part of broadcasts brought to Canadians by Cable Networks.
ParlVU is a government site that lists Webcasts of numerous Parliamentary Sessions and host a Calendar listing when each event it to occur.
For broadcasts related to U.S. Federal politics, go to C-Span. Consists of broadcasts brought to Americans by their Cable Networks.
For a Record of Historical Recordings from C-Span
You can view U.N. Webcasts via their U.N. Webcasts site which also includes a schedule for Webcasts.