By Stan Greenberg and Page Gardner
President Donald Trump won the 2016 election partly because many Americans believed that a businessman not beholden to special interests could shake up politics, get things done and reform government so it finally works for them. Some of those supporters are starting to worry. The surprisingly close contest in the congressional special election in ruby-red Georgia this week telegraphed possible doubts about whether the President and congressional Republicans can bring change. Now new focus-group research reveals the potential for these Trump voters to become disillusioned with his performance before he hits even 100 days.