1.) They will report on another outlet's reporting - and often sites that are PAYWALLED that non-subscribers will NOT have access to, but they will usually either link to those articles directly (at the bottom of their article) or will link to it in their content if someone wants to see the original source.
2.) They have their OWN staff who will actually monitor the broadcast and social media news/politics feeds and will summarize them. So if CNN has a guest on a political show, they will have someone watch that interview/interaction and will summarize it (without the formality of a complete "transcript", like places such as CBS does with "Face the Nation" ), often with certain quotes of interest being focused on in their excerpts).
3.) They will have "guest writers" from various news/political blog sites, actually write/contribute an article about what is going on in the news and politics, and in some cases, the articles are coming from local broadcast/print sites and the authors are credited.
4.) They will often summarize articles from news sources that were carefully buried (not really highlighted on those sites' main pages) that end up PAST the LBN 12-hour cutoff, so they can't be posted here, but Raw Story will do a report on what those articles were describing and will do so within the 12-hour time frame, so they can at least be posted in LBN.
So as an example for me personally, I have subscriptions to a big pile of news/politics sites/magazines/newspapers, etc. But I don't sub to the WSJ. But Raw Story will often summarize articles from them. If there are fireworks going on during some Faux Snooze program (and I sure as hell won't link to them), THEY will summarize what happened during that "Republicans in Disarray" moment that needs to be put out there "in public" since the M$M does so much sanitizing of GOP fumbles.