At the start of the midterm campaign, a Democratic Senate victory appeared to depend on an exceptional set of outcomes. On Tuesday, the party exceeded those expectations, according to the analysis provided in the source report.
The result amounted to a sweeping collapse of the Republican coalition and what the report describes as the largest victory by either party in half a century. Based on estimates, Democrats are expected to win the combined national vote in House races by 13 percentage points. If confirmed, that would be the biggest margin since the elections of 1974 and 1976.
Democrats could also flip as many as seven Senate seats that had favored Republicans by more than 10 points in the previous presidential election. The report says there is no modern precedent for either party performing so strongly in states that had leaned so decisively toward its opponent.
Sources: The New York Times Politics.