In 2010, the citizens of Illinois should send to the Capitol a senator who will bring expertise and independence. The candidate who fits that bill is Mark Kirk. Today the Tribune endorses Kirk, a Republican, for the U.S. Senate seat that Roland Burris soon vacates. To understand our verdict, watch Giannoulias and Kirk's appearance before us this week. You'll find the video at chicagotribune.com/senate. Judge each man's depth and preparedness for the job. Judge knowledge and scope. Judge accomplishment. Judge which candidate has a proven record of thoughtful independence — of bucking his party when the good of this nation...