I'm from europe, and the political ones are very, very rare... at least not in the tech world (macbooks of HR departments might be different though).

Mostly zero stickers, here and there you find some progamming language ones, a tux here and there, kali, anonymous masks, "my other computer is your computer" etc. on security events, i've even seen a phpBB one this year on a relatively new computer, but no trump, lgbt flags and anything anti/nazi related.