The Memo: Left looks to seize on momentum from El-Sayed’s win
Both my own fetch attempt and the article text you supplied were blocked by The Hill's site (403 Forbidden / JavaScript-required access page) — I have no actual article content to work from, only an access-denied message.
I can't produce a reliable summary without the real text. If you're able to copy and paste the article body directly from the page (or another source that carries the same story), I'll summarise it right away.
Explained simply
Abdul El-Sayed is a politician associated with the left wing of the US Democratic Party. In US politics, “the left” usually refers to Democrats who favour stronger public services and more government action on issues such as healthcare and economic inequality.
A win by a left-wing candidate can encourage similar campaigns and shape debate within the Democratic Party. The party includes voters and politicians with a range of views, and its internal contests can influence which policies and candidates it puts forward.
Art Culture Government Politics