“Trump is unpopular and beset by scandal...” Really? I can’t recall another president at a mid term election selling out of arenas. Barry was poison and sidelined for all of 2010 and 2014.
He’s so unpopular no GOP candidates are running away from him.
Read this, from 2010, Obama’s first midterms:
Barack Obama’s final midterm rally highlights declining popularity
Voter disenchantment with US president was reflected by 5,000 empty seats during event at Cleveland's Wolfstein centre
However, in contrast with the 2008 election, when across the US an Obama rally was a hot ticket and people had to be turned away, he attracted only 8,000 to the 13,000 capacity stadium. When he appeared at a rally in the same city in 2008 two days before the White House election, 80,000 turned out.
https://www.theguardian.com/world/2010/oct/31/barack-obama-midterm-campaign-rally
Compare that to the massive crowds Trump is getting at his rallies in his first midterms. Going by crowd size alone, I’d say the Democrats are toast in November.