Skip to main content Part of complete coverage on  Ad blitz
targets Wisconsin voters  By Kevin Bohn, CNN Senior Producer
April 2, 2012 -- Updated 1858 GMT (0258 HKT) Voters in Wisconsin
are sifting through a barrage of ads and mailers before
Tuesday's GOP presidential primary.   • Campaigns indicate
Wisconsin primary could dramatically alter the momentum of GOP
race   • Mitt Romney and allies will have spent $3.03 million in
TV ads through Tuesday's voting   • Rick Santorum's campaign and
super PAC will have put out more than $800,000   • Santorum asks
why Romney is campaigning in Wisconsin if the race is over  You
can follow Kevin Bohn on Twitter @KevinBohnCNN.  Washington
(CNN) -- Ads, phone calls and mailers have bombarded voters in
Wisconsin in the days leading up to Tuesday's vote -- the next
major battleground in the Republican presidential race.  The
Badger State primary has gained significance over the last week
as both Mitt Romney's and Rick Santorum's campaigns have
indicated it could dramatically a