Not quite January 20, but it was close.  As Wikipedia puts it...

"The movement began following Barack Obama's first presidential inauguration (in January 2009) when his administration announced plans to give financial aid to bankrupt homeowners."

Even if we say late January though, at least they waited until Obama was president and started enacting policies they didn't like.  For Trump is was the day after ELECTION DAY that the street protests started, in multiple cities, based simply on being pissed that he won the election.