On the opening day of their national convention, Democrats have chosen to showcase three governors who have a long history of pushing job-killing tax hikes on their respective states: Illinois Governor Pat Quinn, former Virginia Governor Tim Kaine, and Maryland Governor Martin O’Malley. Illinois Governor Pat Quinn, who kicks off the evening of tax hikers, has had a long love affair with tax increases. In May of 2009, Gov. Quinn proposed a 50-percent income tax hike, increasing the income tax rate from 3-percent to 4.5-percent. The proposed tax hike would have taken about $4 billion from Illinois’s private economy near...