As Rep. Tammy Baldwin and former Gov. Tommy Thompson prepare for the first of three debates tonight in a race that will help determine control of the Senate, their campaigns and outside groups are bombarding Wisconsin with advertising to sway the hearts and minds of undecided voters. 

An analysis of expenditures and political ad buys shows an increase in expenditures by campaigns and outside groups heading into the last month of the long, politically charged year. Since April, Wisconsin has garnered national attention from its Republican presidential primary, another primary to determine who would run against Gov. Scott Walker in ...