

To be fair, it seems more like a rich asshole thing, than a political affiliation thing strictly speaking, but there definitely seems to be a strong Republican bias to the perpetrators. I mean, I think even Donald was technically a Democrat during the birthday card period unless I’m mistaken.
Edit:
Republican (1987–1999): Trump first registered as a Republican in 1987.
Reform Party (1999–2001): In 1999, he left the Republican Party and joined the Reform Party, even forming an exploratory committee for a potential presidential run in 2000.
Democrat (2001–2009): He changed his registration to Democrat in 2001.
Republican (2009–2011): He switched back to the Republican Party in 2009.
Unaffiliated (2011–2012): Trump briefly registered with no political party in 2011.
Republican (2012–present): He rejoined the Republican Party in 2012, ahead of the 2012 presidential primary, and has remained a Republican since.
The card is from 2003, so during his Democrat phase. Though it’s pretty clear the man has no actual actual convictions (so to speak) and just does whatever he feels is personally adventageous at any given moment.
https://en.m.wikipedia.org/wiki/Controlled_burn