Abdul El-Sayed won his Michigan race, and it's a win for progressives and a loss for big outside spending in elections.

• El-Sayed defeated Mike Rogers, flipping the race despite heavy spending against him.
• Outside groups, including AIPAC-linked spenders, reportedly poured over $39 million trying to beat him and still lost.
• The result is being read as voters rejecting big-money efforts to buy the seat.
• Supporters are framing it as proof that heavy outside spending doesn't guarantee a win.

Outlook: Expect this result to fuel more progressive challenges against establishment and big-money-backed candidates in upcoming races.