[3] Following controversy over a downtown entertainment complex development, he was re-elected for a four-year term on November 13, 2006, by a slim margin of 730 votes, winning over runner-up candidate and Councillor Rick Downes.
[3] His family were originally from the Lithuanian town of Anyksciai, which was almost wiped out during the Second World War.
[3][7] After finishing two terms as Kingston mayor, Rosen sought the federal Liberal nomination for the federal riding of Kingston and the Islands in 2010, after incumbent Peter Milliken, who was first elected in 1988, announced he would not run again.
Rosen was one of five contenders; the eventual winner was Ted Hsu, who went on to retain the riding for the Liberals in the 2011 federal election.
Rosen announced he would seek the Ontario Liberal Party nomination for the provincial riding of Kingston and the Islands shortly after incumbent John Gerretsen, first elected in 1995, announced on Oct. 18, 2013 that he would not seek re-election.