The latest Keystone Poll finds incumbent Republican Congressman Jim Gerlach locked in a tight battle for re-election with challenger Democrat Lois Murphy. The poll of 431-registered voters conducted by the Center for Opinion Research at Franklin & Marshall College finds Gerlach with a 45-to-38 percent edge. When narrowed to likely voters, Gerlach's advantage is down to 44-to-41 percent. Gerlach scored a two point win over Murphy in 2004. Poll respondents list the war in Iraq, the war on terror and healthcare as the top issues. The sixth district covers portions of Berks, Montgomery and Chester counties.