LAKEWOOD — A crowd was gathering about an hour before Cory Gardner was set to hold an in-person, solo town hall Tuesday afternoon — his third of the day and the first such event in more than a year — ending a day of hostile voter questions across the Front Range. The Republican senator from Colorado appeared earlier in Greeley and Colorado Springs, where rowdy constituents pressed him on everything from health care and North Korea to immigration and President Donald Trump. Already quite the line formed, about 45 minutes until doors open.