Milwaukee: Flat rates and lots of inventory The state primary is two weeks off yet political ads are not clogging airwaves, though conditions have tightened for news   Early upfront outlook: A merry May Forecast: Big Four broadcast networks will see 8 percent CPM gains over last year, with total sales coming in flat to last year   The next wave: Spots face the challenge In the first internet wave, print took a beating as readers and advertisers moved online. Now TV and radio are feeling the heat.   Tampa: Pricier even before political surge Demand was already up, led by auto and finance, even before the lowest unit-rate political window opened for the Florida primary   Look for a flood of super PAC spending With Romney and Gingrich in a dead heat, special interest groups are expected spend heavily on ad inventory in key primary states   Cleveland: Tight and getting more so Demand is already up and political advertising was kicking in even ahead of the lowest-rate window for the March primary   Indianapolis: TV and radio are both strong Pricing is up and likely to climb further under pressure from political spending but also auto, financial and pharmaceutical   Big hiccup brings the ad recovery to a halt Over the third quarter, ad spending slows dramatically as the largest advertisers pull back. Talking with Kantar's Jon Swallen.   Denver: TV's pricy and getting more so Television spending is up 15 percent, driven by automotive and financial, while radio is up by the high single digits   Phoenix: Healthy, with Hispanics key TV and radio spending and prices are flat to a year ago, buoyed by advertisers' push to connect with Spanish-speaking consumers next >>