I bet they wish he was playing a lot more golf.
Funny you should mention Trump’s massive crowd sizes this year.
In 2910, Obama’s first midterms, Obama’s crowd sizes were down up to 80% in 2010 midterm campaigns from 2008, just 2 years before. From The Guardian, a strong Obama supporting outfit:
———— But his famous rhetorical skills are no longer enough, and the Democrats are facing defeat in elections to Congress and for governorships on a scale political analysts say has not been seen in over 60 years.
Screens at the Wolfstein Centre, Cleveland, showed the Obama logo from the 2008 White House race, the old campaign songs were played and the crowd noisily chanted his slogan ‘Yes, we can’. 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