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I know how to download YouTube videos, but not Breitbart videos.

Some clues can be found in this snippet of JSON, which Breitbart's player (jwplayer.com) downloads as it prepares to show the flick:

"duration": 3805,
"image": "https://content.jwplatform.com/thumbs/TYgVGuSC-720.jpg",
"link": "https://content.jwplatform.com/previews/TYgVGuSC",
"mediaid": "TYgVGuSC",
"pubdate": 1536775268,
"recommendations": "https://content.jwplatform.com/v2/playlists/7StNPlvE?related_media_id=TYgVGuSC",
"sources": [
    {
        "file": "https://content.jwplatform.com/manifests/TYgVGuSC.m3u8",
        "type": "application/vnd.apple.mpegurl"
    },
    {
        "file": "https://content.jwplatform.com/videos/TYgVGuSC-25GFhifI.mp4",
        "height": 180,
        "label": "180p",
        "type": "video/mp4",
        "width": 320
    },
    {
        "file": "https://content.jwplatform.com/videos/TYgVGuSC-ilPKdA1q.mp4",
        "height": 270,
        "label": "270p",
        "type": "video/mp4",
        "width": 480
    },
    {
        "file": "https://content.jwplatform.com/videos/TYgVGuSC-TpzG6ZCv.mp4",
        "height": 406,
        "label": "406p",
        "type": "video/mp4",
        "width": 720
    },
    {
        "file": "https://content.jwplatform.com/videos/TYgVGuSC-khrfltxf.mp4",
        "height": 720,
        "label": "720p",
        "type": "video/mp4",
        "width": 1280
    },
    {
        "file": "https://content.jwplatform.com/videos/TYgVGuSC-PoBJ2M9o.m4a",
        "label": "AAC Audio",
        "type": "audio/mp4"
    }
],
"tags": "Google,2016",
"title": "Leaked Video Shows Google Leadership In Dismay At 2016 Election",
"tracks": [
    {
        "file": "https://content.jwplatform.com/strips/TYgVGuSC-120.vtt",
        "kind": "thumbnails"
    }
],
"variations": {}

Pick your resolution and download away. Or, if you want to watch at 1280x720, paste the corresponding URL into your browser's location bar and widen the window until the video box stops getting bigger.