There’s a downside for the tech titans who moonlight in politics. LinkedIn co-founder Reid Hoffman has burst onto the leaderboard of political donations in the age of Trump, cementing his status as a powerbroker in Silicon Valley politics. But over the last few weeks, Hoffman has been learning one of the hard lessons that almost all billionaires discover as they leap into political combat: This isn’t all fun and rainbows. There is serious reputational risk in this dirty world — especially if you fail to scrutinize all of your newfound friends.