Illinois Sen. Mark Kirk was the lone Republican senator to vote against the GOP’s defunding bill. Kirk bolted from his party’s official line because the vote would have hurt his chance of re-election. Kirk won his seat by less than 2 percentage points in 2010, during the Republican-wave election. His likely Democratic opponent will be the popular Congresswoman Tammy Duckworth — a pro-choice, highly decorated Iraq War veteran and double amputee. The University of Virginia’s Larry Sabato now has Kirk’s race listed as a likely win for Democrats in his Crystal Ball po...