A longtime Republican activist hopes to make Democrat Mark Warner a one-term U.S. Senator. Former Republican National Committee Chairman Ed Gillespie (pictured during a 2007 event at UVA’s Miller Center) kicked off his Senate campaign Thursday thanks to a Youtube video. Gllespie is a 52-year-old Alexandria resident who once chaired the Virginia Republican Party. He’s a critic of the 2010 Affordable Care Act, which he calls Obamacare. GOP leaders will choose their Senate nominee in early June at a Roanoke convention. Senator Warner says he has an independent and bipartisan record, and he welcomes a challenge from any Republican.