Cities that are left leaning, that support many of the president's liberal proposals, are having a little trouble choking down the latest election-year, hot-button issue: &nbsp;raising the minimum wage. &nbsp;Even liberal business owners have to evaluate how a minmum wage increase will impact their businesses. &nbsp;The rhetoric sounds so good, but the reality is going to hurt. &nbsp;Read more: &nbsp;<a href="http://www.cnbc.com/id/101655742">www.cnbc.com/id/101655742</a>